How to calculate CFM of the room /Air changes per hour

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CFM stands for cubic feet per minutes.

To calculate CFM, we need to determine the volume of the room and ACH (Air changes per hour) firstly.

We all know how to calcualte the volume.

The product of length , width and height called as volume of the room.

Let us consider the room having 10 feet length and 10 feet width and 10 feet height.

So volume of the room comes around 1000 cubic feet or F3.

Next we need to know about ACH.

ACH calculated as how many times air entering and leaving from the HVAC system in a one hour called as ACH.

ACH depends on temperature and structure of the building and capacity of the equipment etc.

Let us assume ACH as 6 for the proposed room

Now we can calcualte the CFM and refer below,

CFM =(ACH ×Volume of the room)/60

=(6 ×1000)/60

= (6000/60)

CFM=100 cubic feet /min or F3/min

Hope you understand the calculation and other consideration.

Regarding ACH ,we will post the details and standard table following across the industry.
Thanks for the reading!...
Er.Ashokraj S