So would 85 cfm be enough to move air if i went with a spped controller im running a 400 watt hpsOld_SSSC_Guy said:one of the blower speed controllers will do the trick. i run all blowers (not fans) on speed controllers and scale them back about 50%. runs almost silent then - but will only move 1/2 the air. in your case running at 50% would give you about 85cfm. i just bought another 2 of the controllers for $43.
Thanks alot for your replies the speed controller should work just fine the room is 2x4x6Old_SSSC_Guy said:depends more on the room size rather than light size. one rule is to take the cubic feet of the room and divide it by 5 (so you exhaust the whole room every 5 minutes).
so a 10' x 10' x 8' room is 800 cf - divided by 5 = 160 cfm fan
or a 6' x 6' x 6' room is 216 cf - divided by 5 = 43 cfm fan