HVAC

Do you have a kitchen fan and you just want to know how much air it throw?

If yes you need these

Do you work in fan manufacturing unit and want to measure the CFM of fan those are being manufactured?

you need this

Are you a designer of fan and you you want to calculate the expected CFM of fan you are designing?

may be you can find something here

For the calculation of CFM, it is required to know the volume of the space and number of air exchange per hour. If the space dimensions are L (length) feet, W (width) feet, H (height) feet and the required number of air exchange rate is n/hour,

The air volume of the space is L x W x H cu-ft

Total required air flow per hour = L x W x H x n cu-ft

Total required air flow per minute = (L x W x H x n) / 60 CFM

There is a minimum air flow rate for the dwelling kitchen is specified in standard. The minimum air flow requirement is 100 CFM for intermittent and 40 CFM for continuous ventilation for single dwelling unit.

This link may also help: http://www.hvi.org/resourcelibrary/HowMuchVent.html

- MS