Mr D
Wouldn't I need 2 of those 800-1000cfm per room to exchange twice a min? Each room is going to be 900cft.
Thanks DHF
Yes you would need a minimum of 900cfm per room. I missed the second page of this thread, so I was basing my calculations on the 300sqft room mention earlier. I would look into two ~1200cfm fans, one for each 900cft room. Overkill can be controlled with thermostatically controlled outlets ($40 each), if needed. Under sizing however can only be cured with more fans. Do it right the first time, so it only has to be done once