# ventilation am i figureing this correctly?

Discussion in 'Grow Room Design/Setup' started by kronos416, Oct 4, 2007.

1. Based on my calculations for room size . i have two cabinets one is 2x4.5x6=54 cu ft
the flowering one is 3.5x4x7=98cu ft total of 152 cu ft The air exchange every 3 min would be 152 / 3= 50.6 cfm (50.6 cfm) + (50.6 x 10%) + (50.6 x 20%) + (0) = 65.78 rounded up 66 cfm The 10% part of the equation is used and added because im using a cooltube reflector on light and the 20% was added for the use of a carbon filter added to ventilation for a total of "66 CFM IS THE MINIMUM REQUIRED"to ventilate the box`s ..... if this calculation is correct then what size vortex fan and carbon filter should i go with? I need something that will be big enough to pull air through the box`s without the use of additional vent fans???? THANKS

2. Ventilation can make or break your grow,
I think you're aiming a bit too low,
for a room that size, with a few plants in it,
I'd look to exchange air 3 times a minute.

Now 456 cfm's may sound massive,
but I'd really aim higher if intakes are passive,
and higher again to avoid the restriction,
from filters and cooltubes (this rhyme is non-fiction).

Take it or leave it, it's one thing I've learned;
If you skimp on your ventage you're gonna get burned,
So this message in verse should be taken to heart;
Overkill ventilation, right from the start.

3. <TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" UNSELECTABLE="on" width="100%"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">With only an exhaust fan and no intake fan is fine just make sure your intake holes are twice the size as the exaust is,and the vortex is a better choice as far as i am concerned but look at www.plantlightinghydroponics.com or www.bghydroponics.com for your BEST prices.</TD></TR><TR UNSELECTABLE="on" hb_tag="1"><TD style="FONT-SIZE: 1pt" height=1 UNSELECTABLE="on">
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4. Ok i just picked up a vortex 600 6" fan 449 cfm and also a Profilter 75 carbon filter. Damn these carbon filters are heavy!!! Also got a speed control unit for the fan also.... Im a little confused here... I would like to vent the box`s and run ducting to cooltube to carbon filter then out through roof. The Profilter 75 is a reversible filter it has a flange on one end that will fit to a 6" ducting the other end of the Profilter 75 is a solid plug that can be taken out for when the use of the one end is done and you turn the canister around and use the other half of filter.... My confusion is that if the canister is sealed on the one end and open on the other how do i hook this canister up so that all my exhaust filters through the canister then out through roof? Im confused can anyone shed some light on my dilema????? Thanks

5. <TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" width="100%" UNSELECTABLE="on"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">Well im fairly new to this but ide suggest setting the filter on the ground outside the cab. with the fan on top then use a 6" duct from the fan to the top of the cab.,and cut two 6" holes at the bottom far side,your fan will draw the coolest air down low through the grow(cooling and exchanging the o2 produced by your girls with fresh co2)then exhausting the hotest air up high through the top 6" duct into the fan and finally scrubbing the air through your filter,speed controler is very good.</TD></TR><TR UNSELECTABLE="on" hb_tag="1"><TD style="FONT-SIZE: 1pt" height=1 UNSELECTABLE="on">
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6. <TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" width="100%" UNSELECTABLE="on"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">BTW< Isnt that fan going to exchange your rooms air almost 9 times a min.? You may need even more intake area so your plants dont get pushed over,you will use the speed control.
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7. Yes something like 9 times give or take i went with something a lil bigger than needed but that is a good thing lol