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