I have a laboratory that is currently bringing in approximately 1000 CFM of air. This air travels through 12" duct and then into a diffuser that is 48" x 24". CFM was calculated at the end of the 12" duct. I am wanting to install a HEPA filter just above the diffuser but do not want to comprimise too much CFM drop. What information do I need about the HEPA filter to calculate the CFM reduction? Would it simply be the resistance of the filter? Any information would be greatly appreciated.
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