Dandaweedman

HVAC lesson of the day. The CFM of your fan cannot exceed the CFM allowed by your filter. So if you have say... an Elicient 150b at 309 free air CFM and a can filter 38 special 33 that allows 210 CFM for instance, you are loosing whatever extra CFM the fan may allow you.
Since some just set the fan on top of the filter you would want the CFM ratings to be as close as possible.

Can fan 38 special 33 specs

Max cfm: 200/350m³h
@ 0.08 sec contact time
Recommended Min Airflow: 100 cfm
Prefilter: Yes
Flange: 6 & 8"
Dimensions: (with pre-filter)
·Outside Diameter: 305mm/12"
·Height: 330mm/13"
·Total Weight: 11.5kg/25.3lbs.
·Carbon Weight: 7.5kg/16.5lbs.
·Carbon Bed Depth: 50mm/2"
Max Operating Temp: 80ºC
Pressure drop at max cfm: 180pa/. 75wg

Can filter 50 specs

Max cfm: 420/713m³h @ 0.1 sec contact time
Recommended Min Airflow: 210 cfm
Prefilter: Yes
Flange: 6, 8 & 10"
Dimensions: (with pre-filter)
·Outside Diameter: 420mm/16.5"
·Height: 500mm/19.7"
·Total Weight: 25kg/55lbs.
·Carbon Weight: 19kg/42lbs.
·Carbon Bed Depth: 65mm/2.56"
Max Operating Temp: 80ºC
Pressure drop at max cfm: 180pa/. 75wg

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