i mean this is a little off topic... im trying to find out how to lightproof a hole in a box that will be about 100 sq in... not question on fan size.. because i mean its said 3-5 times a minute so 120 ft^3 x 5 times per minute is 600cfm so 450 is about little less than 4 times a minute... main question is how to light proof 2 100 sq in openings regardless of my setup
bloodbrother Reviewed by bloodbrother 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