what size fan would be good for my grow tent?

texastiger707

texastiger707

Active Member
I have a grow tent that is 32x32x63 inches. I have a 250watt hps light with a wing reflector. I am doing a scrog style grow. I was wanting to know what size inline fan should I use? I seen a 4inch and a 6inch. The 4inch is about 200cfm. The 6inch is 440cfm. so what size would be good for my size tent?
 
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bseeds

Well-Known Member
you have about 45 sq feet of air to move a 4 inch would be move then enough put if ever get bigger grow room you mite want bigger
 
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grorite

Well-Known Member
like adjorr said go with a 6" and speed controller just in case you ever want to upgrade you will already have the right size fan I run a 400 watt hid 3x3x6 tent for veg I keep the fan dimmed to 60% and temps stay perfect you could get away with a 4" inch but it will be louder than the 6 with a speed controller
 
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grorite

Well-Known Member
also a 4" isn't much cheaper than a 6 but you make the decision you may want the extra cfms when its gets hot outside
 
texastiger707

texastiger707

Active Member
grorite said:
like adjorr said go with a 6" and speed controller just in case you ever want to upgrade you will already have the right size fan I run a 400 watt hid 3x3x6 tent for veg I keep the fan dimmed to 60% and temps stay perfect you could get away with a 4" inch but it will be louder than the 6 with a speed controller
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I am not really worried about upgrading. I am just doing a small grow with a 250watt light just to save on electric bill. so if I use a 4inch fan. Do I need a speed controller?
 
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grorite

Well-Known Member
nah I wouldn't worry bout a speed controller for a 4" but im still saying its smarter to get the 6" is noise a concern?
 
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grorite

Well-Known Member
just remember depending on how much duct you run and if you plan on a carbon filter that will cut down the cfms alot
 
texastiger707

texastiger707

Active Member
grorite said:
just remember depending on how much duct you run and if you plan on a carbon filter that will cut down the cfms alot
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ok yes. I will be wanting to use a carbon filter during flowering. so I better get the 6inch fan. so does the carbon filter cfm need to be higher or lower than the fan cfm? The 6ich fan is 440cfm. so the the filter should be what?
 
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grorite

Well-Known Member
get one that matches the fan cfm or close I just picked up a 400 cfm phresh filter I would recommend that brand a lil more expensive but worth it
 
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grorite

Well-Known Member
or if your feeling like a baller you could go with a rhino filter top of the line pretty much but there pricey
 
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grorite

Well-Known Member
can you find one in the 400 cfm range that would be more ideal really don't want a filter over the cfm of the fan because it may not scrub it right may have a faint smell still
 
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