Ventilation Help

Ok so I have all my measurements but I can not seem to find a formula anywhere. I know they exist because I have seen them. Anyways I am preparing to vent my room and want to know what I need before I cut my inlet and my vent. My room is 6'4" wide x 16' long. I have 3 600 HPS running with the length of the room. I would say 75% of the room is taken with the other 25% being space to move around on either end. All I have so far is some fexl tubing and a 440 cfm inline fan. Any help would be greatly appreciated.

Bump Bump Bump

Bump again. Need advice

Hey planted,

What the height of your grow room? Multiply your length x width x height to get your cubic foot volume. You need to exchange your airspace 1-5 times per minute, so if your fan is 440 cfm that means it will move 440 cubic feet of air through it.

what CaNucK said, but remember to knock cfm down for carbon filter and any crazy bends you have. More is better.

Also, try this grow room calculator: http://cannaversity.com/calculators/index.php

Choose the lighting calculator on the left side.

Hope it helps