What cfm fan do you recomend to cool off a 1000 watt hps light?

6" ducting w/a 465cfm fan should be good enough for that space.. If you have a carbon filter you might need to add a duct booster fan - cost $50 for a 6" 160cfm unit..

Peace
MC
 
Give the height next time so we can get the cubic foot of the room.
Also is the room a bedroom,closet, is it in the basement or attic. What are normal temps in this room? Does it change alot at night? it the room airconditioned? I can go on bro. More info on your side would let others give better and more accurate answers to your Qs.
 
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