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Posted by Harold hydronicnetwork.net on July 09, 2002 at 06:27:51:

In Reply to: boiler room ventilation posted by Aaron on July 08, 2002 at 09:01:21:

: I have a boiler in a room and need to size a fan, which will keep the room at ambient plus 27 degr. F.

: The boiler is radiating into the room 3240 Btu/min.

: How can I calculate the fan cfm?

: Please advise.

Each pound of air can absorb .24 btu by rising one degree F and occupies about 13 cubic feet. 3240 divided by .24 = 13500 pounds of air times 13 = 175,500 cubic feet at a one degree rise - or 17,550 cfm at a 10 degree rise of air in the room, etc.

OR

3240 divided by .018 (the heat content of one cubic foot of air changing one degree F.) = 180,000 cubic feet --- divided by allowable rise in room temp = cfm required