my next room is 12.5 x12.5 x 9 foot ceilings---156 square feet 1406 cubic feet

i see the math u are doing still a little confusing but i havent really done math like that in 10 damn years:stoned:


1406 / 5 = 281 (I'm rounding everything up) = air exchanged every 5 minutes
281* 1.5 = 421 = one 90 degree duct elbow
281 * 1.3 =365 = resistance of carbon filter
+ 44 = 10 feet of duct
+ 5 = +/- 10% for error

Add it up: 281 + 421 +365 + 44 + 5 = 1116 CFM


if thats correct then i should just buy 2 One for over 1200 cfm and maybe keep the 8 in valuline 745 cfm running 2 ...Please correct me if i am wong

THOSE CEILING HEIGHTS may be between 7 1/2 to 9 i cant remember off the top of my head