cfm

OK hi everybody, new guy here. I have this inline fan: connected to a speedster, with at least 7 meters of ducting connected to the inline fan. First meter or so is 4 inch, then connected to the remaining 6 meters of ducting which is 6 inch. With 3 nice bends in ducting to reach the final...

i got a 2x3x6 room and its air cooling a 400w light and i want a carbon filter on it too. so how much cfm do you think that would be? and i know i want the fan pulling air out of the room but do i want to push or pull the air through the caerbon filter? thank you BENNN

Hi folks this is my first grow room. I cant figure out whats best in term of ventilation for making negative pressure in my flowering room. I need someone to give me some advice. My room is sealed, its 4.5 by 4.5 foot, with 5.5 foot high. I bought a 245 cfm fan and a 50 cfm fan the lady...