I have an 672 cubic foot area (12x8x7), an 1000W HPS and I'm using a 450 CFM with a carbon filter. So I don't understand why the 300 can't do the job, it may be an intake problem or where you exhaust...
LuciferN Reviewed by LuciferN on . Ventilation question Ok so I was reading rhizomes (i think) beginnerguide pertaining to ventilation just now and read that a rule of thumb for intake area was CFM of fan*.05 sq inches. Right now for a 450 CFM only 2 6 inch openings are present which is roughly 60 sq inches which is WAY less than 225 and there is negative pressure/suction inside the box.. so obviously adding more intake area is required but how can I do this and make it light proof at the same time? I mean for the current situation there are just Rating: 5