The Role Of The Impeller In A Centrifugal Fan<\/strong><\/span><\/h2>\n[\/et_pb_text][et_pb_text module_id=”key_knife-destination” _builder_version=”4.19.4″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ global_colors_info=”{}”]The rotating circular impeller at the centre of the fan features a series of angled blades that draw in air and then push it away from the central axis.<\/p>\n
These blades cause the air to move in a circular motion as it is pulled into the centre of the fan. As the air moves through the impeller, the blades apply force to the air, causing it to move outwards and away from the centre of the fan.<\/p>\n
This movement of air creates a pressure difference between the air inside and outside the fan. This causes air to flow into the fan and then be expelled via the discharge port.<\/p>\n
The impeller is responsible for creating the pressure and flow of air that is necessary for the fan to function. The impeller\u2019s rotation speed and blade design are key factors that determine the performance of the fan and its ability to move air effectively and meet the requirements of the application.<\/p>\n
Impellers can look and perform very differently, depending on their type:
\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” global_colors_info=”{}”][et_pb_column type=”1_3″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”18px” text_orientation=”center” link_option_url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-bpr\/” global_colors_info=”{}”]FORWARD CURVED<\/strong>
\n[\/et_pb_text][et_pb_image src=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2023\/02\/Untitled-1.jpg” alt=”Forward curved centrifugal fan and impeller” title_text=”EV BP Fan & Impeller – Forward Curve” url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-bpr\/” align=”center” align_tablet=”center” align_phone=”center” align_last_edited=”on|tablet” _builder_version=”4.21.2″ _module_preset=”default” width=”80%” width_tablet=”80%” width_phone=”100%” width_last_edited=”on|tablet” module_alignment=”center” global_colors_info=”{}”][\/et_pb_image][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ global_colors_info=”{}”]The classic \u2018hamster wheel\u2019 design.<\/strong>
\nLess efficient but more compact.<\/strong>
\n[\/et_pb_text][et_pb_button button_url=”https:\/\/www.aircontrolindustries.com\/us\/contact\/” button_text=”Do you have any questions for us?” disabled_on=”on|on|off” _builder_version=”4.19.4″ _module_preset=”default” custom_margin=”||39px||false|false” locked=”off” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”18px” text_orientation=”center” link_option_url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-eu\/” locked=”off” global_colors_info=”{}”]BACKWARD CURVED<\/strong>
\n[\/et_pb_text][et_pb_image src=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2023\/02\/EU-Fan-Impeller-Backward-Curve.jpg” alt=”Backward Curve fan and Impeller” title_text=”EU Fan & Impeller – Backward Curve” url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-eu\/” align=”center” align_tablet=”center” align_phone=”center” align_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”80%” width_tablet=”80%” width_phone=”100%” width_last_edited=”on|tablet” module_alignment=”center” locked=”off” global_colors_info=”{}”][\/et_pb_image][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” link_option_url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-eu\/” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]More efficient but larger and less compact.<\/strong>
\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”18px” text_orientation=”center” link_option_url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-ap-ape\/” locked=”off” global_colors_info=”{}”]RADIAL<\/strong>
\n[\/et_pb_text][et_pb_image src=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2023\/02\/APE-Fan-Impeller-Radial.jpg” alt=”Radial Fan and Impellwe” title_text=”APE Fan & Impeller – Radial” url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-ap-ape\/” align=”center” align_tablet=”center” align_phone=”center” align_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”80%” width_tablet=”80%” width_phone=”100%” width_last_edited=”on|tablet” module_alignment=”center” locked=”off” global_colors_info=”{}”][\/et_pb_image][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” link_option_url=”https:\/\/www.aircontrolindustries.com\/products\/centrifugal\/large\/ev-ap-ape\/” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]Capable of generating higher pressures.<\/strong>
\n[\/et_pb_text][et_pb_button button_url=”https:\/\/www.aircontrolindustries.com\/contact\/” button_text=”Do you have any questions for us?” disabled_on=”off|off|on” _builder_version=”4.19.4″ _module_preset=”default” custom_margin=”40px||40px||true|false” locked=”off” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.18.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”30px” text_line_height=”1.1em” header_text_color=”#003366″ header_font_size=”25px” header_2_font_size=”25px” custom_margin=”0px||0px||false|false” custom_margin_tablet=”0px||30px||false|false” custom_margin_phone=”0px||30px||false|false” custom_margin_last_edited=”on|desktop” custom_padding=”20px||15px||false|false” custom_padding_tablet=”20px||||false|false” custom_padding_phone=”20px||||false|false” custom_padding_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”]<\/p>\nHow The Fan Housing Affects Pressure And Airflow<\/strong><\/span><\/h2>\n[\/et_pb_text][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]The fan housing directs the air moved by the impeller; it surrounds the impeller and forms a chamber that contains the impeller and the air being moved.<\/p>\n
The housing<\/strong> is designed to guide the air as it flows through the fan and push it out \u2013 via the discharge point \u2013 in a specific direction. This helps to increase the pressure and velocity of the air as it exits the fan. The housing prevents air leaks and protects the impeller and other internal components from external elements.<\/p>\nThe shape and size of the housing are also important factors that determine the performance of the fan and its ability to move air effectively.<\/p>\n
The typical clearance between blade tips and housing is 0.25% of the impeller\u2019s diameter. Reducing this clearance will increase peak fan pressure (and vice versa). Housings can also include features such as inlet and outlet cones, vanes and scroll sections to further shape and guide the airflow.<\/p>\n
A centrifugal fan housing typically looks like an ammonite shell without the spiral. This is called a volute casing; it is a curved funnel that increases in area as it approaches the discharge port.<\/p>\n
The \u2018ammonite\u2019-style shape of a volute casing uses an outlet flow design. The air leaving the impeller has kinetic energy proportional to its velocity pressure \u2013 resulting in greater efficiency.<\/p>\n
This is because the kinetic energy of the air helps to maintain its momentum as it flows through the fan, reducing losses due to friction and turbulence. Additionally, the ammonite-style shape of the volute casing helps to smooth out the flow of the air and further reduce these losses \u2013 resulting in a more efficient fan overall.
\n[\/et_pb_text][et_pb_image src=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2023\/03\/Housing-and-Impellers.jpg” alt=”Cut through view of a multistage centrifugal fan” title_text=”Housing and Impellers” align=”center” _builder_version=”4.19.4″ _module_preset=”default” width=”50%” width_tablet=”50%” width_phone=”100%” width_last_edited=”on|phone” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”30px” text_line_height=”1.1em” header_text_color=”#003366″ header_font_size=”25px” header_2_font_size=”25px” custom_margin=”0px||0px||false|false” custom_margin_tablet=”0px||30px||false|false” custom_margin_phone=”0px||30px||false|false” custom_margin_last_edited=”on|desktop” custom_padding=”20px||15px||false|false” custom_padding_tablet=”20px||||false|false” custom_padding_phone=”20px||||false|false” custom_padding_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”]<\/p>\n
How The Fan\u2019s Motor Affects Performance <\/strong><\/span><\/h2>\n[\/et_pb_text][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]Virtually all fans supplied by ACI are powered by electric motors. We have worked on some projects involving hydraulically powered fans (which utilise force created by a pump) but these are rare.<\/p>\n
Most centrifugal fans are direct drive:<\/strong> the impeller is mounted on the shaft extension of an electric motor. However, some are belt driven \u2013 the motor is used to rotate a belt which then in turn moves the impeller. This creates a gearing effect which increases the rotational speed of the impeller \u2013 improving output but reducing energy efficiency.<\/p>\nVarious factors will affect electric motor performance<\/strong> \u2013 and therefore the rotational speed of the impeller and the efficiency of the fan as a whole. These factors include the number of poles in the motor and the frequency of the AC mains electricity supply.
\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”30px” text_line_height=”1.1em” header_text_color=”#003366″ header_font_size=”25px” header_2_font_size=”25px” custom_margin=”0px||0px||false|false” custom_margin_tablet=”0px||30px||false|false” custom_margin_phone=”0px||30px||false|false” custom_margin_last_edited=”on|desktop” custom_padding=”20px||15px||false|false” custom_padding_tablet=”20px||||false|false” custom_padding_phone=”20px||||false|false” custom_padding_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”]<\/p>\nHow The Number Of Fan Motor Poles Affects Impeller Speed<\/strong><\/span><\/h2>\n[\/et_pb_text][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]The number of poles in an electric motor refers to the number of magnetic poles (north and south) that are used in the stator (the stationary part of the motor). The number of poles affects the motor\u2019s speed because it determines the number of cycles of magnetic field changes that occur in the motor per revolution of the rotor (the rotating part of the motor).<\/p>\n
A two-pole motor has two north and two south poles, while a four-pole motor has four north and four south poles. The more poles a motor has, the slower it will rotate for a given frequency of the alternating current (AC) power supply.<\/p>\n
The relation between the number of poles, the power supply frequency and the motor\u2019s speed is described by this formula:<\/p>\n
<\/p>\n
![\"\"](\"https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2023\/02\/Equation-2-1-1024x256.jpg\")
<\/p>\n
<\/p>\n
The more poles a motor has, the slower it will rotate for a given power supply frequency.
\n[\/et_pb_text][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” width=”95%” width_tablet=”92%” width_phone=”100%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”|16px|40px|16px|false|true” custom_padding=”||||false|false” custom_padding_tablet=”|24px||24px|false|true” custom_padding_phone=”|24px||24px|false|true” custom_padding_last_edited=”on|tablet” module_alignment_tablet=”center” module_alignment_phone=”center” module_alignment_last_edited=”on|tablet” box_shadow_style=”preset6″ global_colors_info=”{}”]<\/p>\n
<\/p>\n
Example:<\/strong>\u00a0a four-pole motor running on a 60Hz power supply will rotate at 1,800 RPM, while a two-pole motor running on the same power supply will rotate at 3,600 RPM.<\/p>\n <\/p>\n
[\/et_pb_text][et_pb_button button_url=”https:\/\/www.aircontrolindustries.com\/us\/contact\/” button_text=”Get expert help specifying the fan for you” _builder_version=”4.19.4″ _module_preset=”default” custom_margin=”||18px|0px|false|false” custom_margin_tablet=”||18px|0px|false|false” custom_margin_phone=”||18px|0px|false|false” custom_margin_last_edited=”on|tablet” locked=”off” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”30px” text_line_height=”1.1em” header_text_color=”#003366″ header_font_size=”25px” header_2_font_size=”25px” custom_margin=”0px||0px||false|false” custom_margin_tablet=”0px||30px||false|false” custom_margin_phone=”0px||30px||false|false” custom_margin_last_edited=”on|desktop” custom_padding=”20px||15px||false|false” custom_padding_tablet=”20px||||false|false” custom_padding_phone=”20px||||false|false” custom_padding_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”]<\/p>\n
How AC Frequency Affects Fan Motor Performance<\/strong><\/span><\/h2>\n[\/et_pb_text][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]Frequency in AC electricity supply refers to the number of oscillations or cycles of the voltage and current that occur in a second. The unit of frequency Hertz (Hz) represents one cycle per second.<\/p>\n
In the case of the power grid, the frequency is determined by the number of times the alternating current changes direction in one second. The most common frequency for AC power used in homes and buildings is:<\/p>\n
\n- UK and most other countries<\/strong> \u2013 50Hz<\/li>\n
- North America<\/strong> \u2013 60Hz<\/li>\n
- Brazil and Japan<\/strong> \u2013 50Hz in some parts of the country, 60Hz in others.<\/li>\n<\/ul>\n
The AC power supply’s frequency affects a fan’s rotational speed because it is closely related to the number of poles in the fan\u2019s electric motor. As the frequency of the power supply increases, the speed of the fan will also increase (assuming that the number of poles in the motor remains the same).<\/p>\n
Using that formula again: Speed (RPM) = (120 x Frequency)\/number of poles.<\/strong>
\n[\/et_pb_text][et_pb_text _builder_version=”4.19.4″ _module_preset=”default” width=”95%” width_tablet=”92%” width_phone=”100%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”|16px|40px|16px|false|true” custom_padding=”||||false|false” custom_padding_tablet=”|24px||24px|false|true” custom_padding_phone=”|24px||24px|false|true” custom_padding_last_edited=”on|tablet” module_alignment_tablet=”center” module_alignment_phone=”center” module_alignment_last_edited=”on|tablet” box_shadow_style=”preset6″ locked=”off” global_colors_info=”{}”] <\/p>\nExample:<\/strong> A four-pole fan motor running on a 60Hz power supply will rotate at 1,800 RPM, while the same fan motor running on a 50Hz power supply will rotate at 1,500 RPM.<\/p>\n
\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”30px” text_line_height=”1.1em” header_text_color=”#003366″ header_font_size=”25px” header_2_font_size=”25px” custom_margin=”0px||0px||false|false” custom_margin_tablet=”0px||30px||false|false” custom_margin_phone=”0px||30px||false|false” custom_margin_last_edited=”on|desktop” custom_padding=”20px||15px||false|false” custom_padding_tablet=”20px||||false|false” custom_padding_phone=”20px||||false|false” custom_padding_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”]<\/p>\n
Limitations Affecting Centrifugal Fans<\/strong><\/span><\/h2>\n[\/et_pb_text][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]<\/p>\n
As you have read, centrifugal fans and blowers offer a range of excellent benefits \u2013 which is why we use them in the vast majority of our air knives and other air delivery systems. However, centrifugal fans have two limitations.<\/span><\/p>\nThe first relates to the difference between static and dynamic pressure:<\/p>\n
\n- Static pressure (Pa or Ps)<\/strong> \u2013 the resistance pressure that the fan must blow against to move air in the desired direction. If the fan is blowing against high pressure, it requires more power and delivers less air.<\/li>\n
- Dynamic pressure (Pd)<\/strong> \u2013 this is the pressure created by the movement of air. It rises as velocity increases and is always positive.<\/li>\n<\/ul>\n
If you under-specify and\/or under-engineer a centrifugal fan, if you ask too much of it, then the static pressure may exceed the dynamic pressure.<\/p>\n
At this point, the air being moved will stop moving in the desired direction and back up down the inlet (unlike in a positive displacement compressor which creates a \u2018one-way door\u2019 so the air can move in only one direction \u2013 it cannot travel back down the inlet).<\/p>\n
[\/et_pb_text][et_pb_icon font_icon=”s||divi||400″ icon_color=”#1c6992″ icon_width=”75px” align=”left” align_tablet=”left” align_phone=”center” align_last_edited=”on|phone” _builder_version=”4.23.1″ _module_preset=”default” custom_margin=”14px|0px|30px|0px|false|false” custom_margin_tablet=”14px|0px|30px|0px|false|false” custom_margin_phone=”14px|0px|30px|0px|false|false” custom_margin_last_edited=”on|desktop” custom_padding=”|0px|||false|false” custom_padding_tablet=”|0px|||false|false” custom_padding_phone=”|0px|||false|false” custom_padding_last_edited=”on|desktop” global_colors_info=”{}”][\/et_pb_icon][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ global_colors_info=”{}”]The second limitation relates to human error \u2013 miswiring during the installation of the centrifugal fan\u2026
\n[\/et_pb_text][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”17px” width=”95%” width_tablet=”90%” width_phone=”100%” width_last_edited=”on|tablet” custom_margin=”|||0px|false|false” custom_margin_tablet=”|||0px|false|false” custom_margin_phone=”|20px||0px|false|false” custom_margin_last_edited=”on|tablet” custom_padding=”|20px||20px|false|true” custom_padding_tablet=”|20px||20px|false|true” custom_padding_phone=”|20px||20px|false|true” custom_padding_last_edited=”on|phone” module_alignment_tablet=”left” module_alignment_phone=”center” module_alignment_last_edited=”on|tablet” box_shadow_style=”preset1″ box_shadow_color=”#1c6992″ global_colors_info=”{}”]<\/p>\n
<\/p>\n
If you miswire an axial fan – the impeller will rotate in the opposite direction. It will suck instead of blow, so the error is easy to spot.<\/p>\n
<\/p>\n
[\/et_pb_text][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”17px” width=”95%” width_tablet=”90%” width_phone=”100%” width_last_edited=”on|tablet” custom_margin=”|||0px|false|false” custom_margin_tablet=”|||0px|false|false” custom_margin_phone=”|20px||0px|false|false” custom_margin_last_edited=”on|tablet” custom_padding=”|20px||20px|false|true” custom_padding_tablet=”|20px||20px|false|true” custom_padding_phone=”|20px||20px|false|true” custom_padding_last_edited=”on|phone” box_shadow_style=”preset1″ box_shadow_color=”#1c6992″ global_colors_info=”{}”]<\/p>\n
<\/p>\n
If you miswire a centrifugal fan during installation – it will still blow air in the right direction \u2013 just not as powerfully. This makes underperformance issues harder to diagnose if you are not an experienced fan engineer.<\/p>\n
<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”25px|20px|25px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|40px||60px|false|false” custom_margin_last_edited=”on|desktop” custom_padding=”0px|0px|0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|||0px|false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.18.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” text_font_size=”30px” text_line_height=”1.1em” header_text_color=”#003366″ header_font_size=”25px” header_2_font_size=”25px” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” custom_padding_last_edited=”on|tablet” locked=”off” global_colors_info=”{}”]<\/p>\n
Get expert technical advice<\/span><\/h2>\n[\/et_pb_text][et_pb_text module_id=”key_knife-destination” _builder_version=”4.23.1″ _module_preset=”default” text_font=”Roboto Slab||||||||” text_line_height=”26px” header_text_color=”RGBA(255,255,255,0)” header_4_text_color=”#c8963e” custom_margin=”||||false|false” custom_padding=”18px|0px|18px|0px|false|true” custom_padding_tablet=”18px|0px|18px|0px|false|true” custom_padding_phone=”|0px||0px|false|true” custom_padding_last_edited=”on|tablet” border_color_all=”#e8e8e8″ locked=”off” global_colors_info=”{}”]<\/p>\n
Need further guidance on the best centrifugal fan for your application?<\/p>\n
[\/et_pb_text][et_pb_button button_url=”https:\/\/www.aircontrolindustries.com\/us\/contact” button_text=”Contact our fan engineers for specialist advice.” _builder_version=”4.19.4″ _module_preset=”default” custom_margin=”36px||50px||false|false” locked=”off” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.19.4″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” header_3_font=”|600|||||||” header_3_text_align=”left” background_color=”#f3f8fd” custom_padding=”12px||8px|30px|false|false” text_orientation_tablet=”” text_orientation_phone=”center” text_orientation_last_edited=”on|phone” global_colors_info=”{}”]<\/p>\n
Why ACI?<\/h3>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ use_custom_gutter=”on” make_equal=”on” _builder_version=”4.19.4″ _module_preset=”default” width=”75%” width_tablet=”” width_phone=”95%” width_last_edited=”on|phone” module_alignment=”center” custom_padding=”|0px||0px|false|false” locked=”off” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb image=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2021\/07\/Technical-expertise-blue-1.png” _builder_version=”4.19.4″ _module_preset=”default” body_font=”|300|||||||” body_font_size=”14px” custom_margin=”|40px||40px|false|true” custom_margin_tablet=”|40px||40px|false|true” custom_margin_phone=”|20px||20px|false|true” custom_margin_last_edited=”on|phone” custom_padding=”20px|20px|20px|20px|true|true” border_radii=”off|1px|1px|1px|1px” border_width_all=”1px” border_color_all=”#D6D6D6″ border_width_top=”1px” global_colors_info=”{}”]<\/p>\n
50+ years of technical expertise and experience.<\/p>\n
[\/et_pb_blurb][et_pb_blurb image=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2021\/07\/happy-customers-blue-1.png” _builder_version=”4.19.4″ _module_preset=”default” body_font=”|300|||||||” body_font_size=”14px” custom_margin=”|40px||40px|false|true” custom_margin_tablet=”|40px||40px|false|true” custom_margin_phone=”|20px||20px|false|true” custom_margin_last_edited=”on|phone” custom_padding=”20px|20px|20px|20px|true|true” border_radii=”off|1px|1px|1px|1px” border_width_all=”1px” border_color_all=”#D6D6D6″ border_width_top=”1px” locked=”off” global_colors_info=”{}”]<\/p>\n
Thousands of happy customers across the world.<\/p>\n
[\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb image=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2021\/07\/world-class-solutions-blue-1.png” _builder_version=”4.19.4″ _module_preset=”default” body_font=”|300|||||||” body_font_size=”14px” custom_margin=”|40px||40px|false|true” custom_margin_tablet=”|40px||40px|false|true” custom_margin_phone=”|20px||20px|false|true” custom_margin_last_edited=”on|phone” custom_padding=”20px|20px|20px|20px|true|true” border_radii=”off|1px|1px|1px|1px” border_width_all=”1px” border_color_all=”#D6D6D6″ border_width_top=”1px” locked=”off” global_colors_info=”{}”]<\/p>\n
World-class solutions \u2013 Distributors, agents and partners in 40+ countries.<\/p>\n
[\/et_pb_blurb][et_pb_blurb image=”https:\/\/www.aircontrolindustries.com\/wp-content\/uploads\/2021\/07\/guaranteed-performance-blue-1.png” _builder_version=”4.16″ _module_preset=”default” body_font=”|300|||||||” body_font_size=”14px” custom_margin=”|40px||40px|false|true” custom_margin_tablet=”|40px||40px|false|true” custom_margin_phone=”|20px||20px|false|true” custom_margin_last_edited=”on|phone” custom_padding=”20px|20px|20px|20px|true|true” border_radii=”off|1px|1px|1px|1px” border_width_all=”1px” border_color_all=”#D6D6D6″ border_width_top=”1px” locked=”off” global_colors_info=”{}”]<\/p>\n
Performance guaranteed \u2013 all standard and custom systems will perform as tested and specified. Guaranteed results and savings.<\/p>\n
[\/et_pb_blurb][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.19.4″ _module_preset=”default” width=”90%” custom_margin=”25px|40px|0px|60px|false|false” custom_margin_tablet=”25px|40px|0px|60px|false|false” custom_margin_phone=”25px|11px|0px|11px|false|true” custom_margin_last_edited=”on|phone” custom_padding=”0px||0px|0px|false|false” global_colors_info=”{}”][et_pb_row custom_padding_last_edited=”on|tablet” _builder_version=”4.17.3″ _module_preset=”default” width=”100%” width_tablet=”90%” width_phone=”90%” width_last_edited=”on|tablet” module_alignment=”center” custom_margin=”15px|0px|15px|20px|false|false” custom_margin_tablet=”15px|40px||60px|false|false” custom_margin_phone=”15px|0px||0px|false|true” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px|32px|false|false” custom_padding_tablet=”|||0px|false|false” custom_padding_phone=”|10px||10px|false|true” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.17.3″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.23.1″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
DON’T MISS THESE RELATED ARTICLES<\/h3>\n
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[\/et_pb_blurb][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"
The Pros\/cons of centrifugal fans and what affects their performance.<\/p>\n","protected":false},"author":11,"featured_media":68410,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","inline_featured_image":false,"footnotes":""},"categories":[495],"tags":[],"class_list":["post-68546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-movement-solutions-us"],"acf":[],"yoast_head":"\n
How Centrifugal Fans Work And Why It Matters | ACI<\/title>\n<meta name=\"description\" content=\"Pros\/cons of centrifugal fans. How the impeller, motor and housing affect performance. Centrifugal vs axial fans, when to use each type. Read more\u2026\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.aircontrolindustries.com\/us\/uncategorized-us\/how-do-centrifugal-fans-work\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Centrifugal Fans Work And Why It Matters | ACI\" \/>\n<meta property=\"og:description\" content=\"Pros\/cons of centrifugal fans. How the impeller, motor and housing affect performance. Centrifugal vs axial fans, when to use each type. 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