How To Calculate Air Changes per Hour

How do you calculate how much air or CFM you need to provide to achieve a certain number of air changes per hour? We’ll show you how to determine the amount of CFM or air required for a space based on the required air change rate per hour. Often specifications or standards will mandate a minimum air change per hour for a room for ventilation purposes, odor control, pressure relationship between spaces, or to achieve a cleanliness level like in a cleanroom or operating room.

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[yousefaboshadyzero]

Very useful video, I hope you take again about cleaning room, operation room and how to control their pressure according to AShRae standard ❤❤❤❤❤❤❤❤

[andrescientos]

I don't understand how separate rooms under the same air system need different ACH. Are they programmable to distribute air differently to each room individually as needed?

[badreddinekassahlaouar]

Thanks for your Time, i need a vidéo explain how to control the pression in the opération room

[rafcol]

Hello, and CFM cooling is Q/1.1*ACF*DT ? CFM cooling from Sensible Load, CFM from occupied zone ASHRAE 62.1, and CFM from INFILTRATI could explain the relation between ALL CFM.

[angxj]

Hi, I am confused with the difference between ventilation ACH, minimum ACH and recirculated ACH. Does that mean for the last example in hospital recovery room, we total need intake of 6 ACH, where 2 ACH is exhausted to the outside each time and 4 ACH is recirculated back to the HVAC equipment?

[williamhaynesjr.]

What outside minimum temperature 2 use a/c?

[zabidi]

Do like to share this very informative video please.