A 440 CFM inline fan hooked up to a fan speed controller on low at all times. What is the cfm? How am I supposed to figure this out. It doesn't give a % as to how much it lowers the CFM rating. Just high medium or low
well, you won't beable to know. the thing is you want your fan to run longer and still maintain temperatures in 72-80 range, idea is for new air exchange as well as removing heat, if you can remove just enough to stay at your temp with your fan running you will always have cool fresh air coming in.