ventilation for grow cupboard

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wullie23

Member
Hi guys any one any idea how much ventilation I would need for my grow room it's 3 foot x 3 foot x 2 meters and I am using a 600 watt hps any help would be greatly appreciated thanks
 
vostok

vostok

Well-Known Member
3x3x6 =54 cubic feet, to move every 5 minutes, to vent 10 cubic feet per minute yeah a 6 inch vortex will do, just have 3x 4 inch passive holes at base
 
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wullie23

Member
Sorry what do you mean by passive holes I'm new to this and just to get ventilation in so I can get my hps in would any 6 inch fan do as I am on a budget
 
kimoolos

kimoolos

Well-Known Member
Amazon or eBay have loads of choices of inline fans. Passive holes mean there are just open holes or holes with ducting connected with no fan. Active=fan, passive=no fan and as long as you have an exhaust fan up high as exhaust (your 6" Inline) this will create negative pressure and allow your passive holes on the bottom to suck air in acting as fresh air intake.
 
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wullie23

Member
OK thanks I have a cupboard grow so my hole's are on the ceiling 1intake in from breather tile in roof and 1 in to loft do u know how much suction I need per hour m3/h
 
kimoolos

kimoolos

Well-Known Member
Hmmm metric, someone may correct me if my math is wrong. If your saying 260 cubic meters per hour that'd be roughly 86 cubic feet per hour. You need exhaust to be able to remove your total amount of cubic feet (ie what Vostok said above 54 cubic feet) in 5 minutes or less. At 86 cubic feet per hour that is 1.43 cubic feet per minute...which is not enough. I could totally be jacking up the math. Like Vostok and the other replies said above most 6" inlines with proper passive intake should work fine for your space.
 
kimoolos

kimoolos

Well-Known Member
wullie23 said:
What would be the right m3/h for my space as most fans tell u how much m3/h that I've been looking at
Click to expand...
Sorry man, my math was all jacked up. Divided when I should have multiplied. 260 m3/h equals 153 cubic feet per minute. So that fan should work fine.
 
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wullie23

Member
Hi guys I am still un sure I was talking to different Members and I am confused now lol people were saying I need a rvk 150 l1 @ 720m3/hbecause I am using a 600 watt hps is this true? Or not
 
Gratefulgrowin93

Gratefulgrowin93

Well-Known Member
with my 600 watt in a 4 x 4 space a 6 in vortex fan does the trick with two passive intakes open at bottom of tent temps usually stay between 74 and 80 on hot summer days with 35 to 40% humidity usually :)
 
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