To help ensure that all aspects of fan sizing have been considered the following check list may be useful.

1ST PARAMETER - VOLUME FLOW RATE:

Velocity required?

Does this take into account the worst case open area?

Density of the air being moved (temp. or different gas)?

2ND PARAMETER - PRESSURE:

Pressure required to generate desired flow through open area?

Pressure drop across filter?

Pressure drop due to ducting?

OTHER PARAMETERS TO CONSIDER:

Any special hazards - flammable gas, corrosion agents etc?

Noise level restrictions?

Inlet and discharge configuration?

Electrical supply - is speed control required?

Physical size constraints?

Even flow across aperture - if a large area then poor distribution could occur?

Dwell time - is the velocity across the filter giving desired dwell times?


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