mellowmama
New Member
Noob here. I have searched this and other forums, plus the internet in general, and still can't decide. I am interested in a Panasonic Whisperline In-Line Fan, thanks to a recommendation from another forum member. I am having trouble deciding between the 240 cfm and the 340 cfm. Price difference is just $5 on Amazon.
The most informative article I found on calculating needed cfm said:
8' x 8.5' x 7' = 476
exchange every 3 minutes = 476/3 = 159
add 5% per air-cooled light (1)
add 5% for co2 (maybe later)
add 20% for carbon filter
5 + 5 + 20 = 30%
159 x 1.30% = 206
By this calculation the 240 cfm should be sufficient. I will be venting this size room, but the room itself is not a true grow room; instead a turnkey 2 x 3 6 closet will be in the closed room, with the closet venting through an Odorsok and cooling a 600 watt hps. Just being extra cautious. I can't tell yet how severe the bends in the ductwork will be, but there will be some.
So, 240 or 340? Is there a negative to choosing too high on cfm?
Also, about can filters... I assume one chooses a model where the maximum cfm is close to the same cfm as the fan?
Anyone have any preferences for brands of can filters? Anyone have any experience with the Can-Lite?
Thanks for any and all help!
mellow
The most informative article I found on calculating needed cfm said:
8' x 8.5' x 7' = 476
exchange every 3 minutes = 476/3 = 159
add 5% per air-cooled light (1)
add 5% for co2 (maybe later)
add 20% for carbon filter
5 + 5 + 20 = 30%
159 x 1.30% = 206
By this calculation the 240 cfm should be sufficient. I will be venting this size room, but the room itself is not a true grow room; instead a turnkey 2 x 3 6 closet will be in the closed room, with the closet venting through an Odorsok and cooling a 600 watt hps. Just being extra cautious. I can't tell yet how severe the bends in the ductwork will be, but there will be some.
So, 240 or 340? Is there a negative to choosing too high on cfm?
Also, about can filters... I assume one chooses a model where the maximum cfm is close to the same cfm as the fan?
Anyone have any preferences for brands of can filters? Anyone have any experience with the Can-Lite?
Thanks for any and all help!
mellow