Inline Fan Size

My main flower room is 5x5 but I also have more space in that room that im not utilizing because theres a water/heater hvac system in there.. Also more empty space under the stairs which is 14'x4'.. Am I only supposed to calculate the 5x5 or the whole SQ of that room?

For air exchange purposes (to maintain co2) use the whole space if its free moving air (not a tent in a space) You need the volume not the area so need to include the height too.

For temp control, heat removal purposes use the following calculation to find the approx. cfm required to stay at the desired air temp.

It boils down to CFM = 3.16 x Watts / DT(°F)

Watts is the lighting power (and any other 'hot' things in the grow space) in Watts.
DT is the allowable temperature rise within the enclosure (i.e. desired temperature minus ambient temperature) in °F.

So, to work out the size of fan required (in CFM) simply plug your lighting Wattage into the equation along with the DT value.

Personally I would go with the second calculation

Damn... Im gonna need a huge inline for such small space. Do u think i would be better off panda film the 5x5 area and stick a 6-8" inline?

Cannademik said:

Damn... Im gonna need a huge inline for such small space. Do u think i would be better off panda film the 5x5 area and stick a 6-8" inline?

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i would build out a 5x5 room. insulate it, light proof it, etc.

rkymtnman said:

i would build out a 5x5 room. insulate it, light proof it, etc.

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For sure, i thought that would be a better idea!