Ventinlation for new grow rooms

hdb3z4x

Member
I am building my new grow room right now and I will have two rooms split. One for veg one for flower. I currently have my flower room built which is 9x9x7 and my veg room built which is 5x9x7. i am running two 1000 watts in the flowering room and 1 400W in the veg along with some cfl's for the clones...

The way that I figure my ventilation is by the following:

9x9x7 = 567
divide by 5 for the amount of time it should take to clean the room = 113.4 CFM required
So I will use a 200CFM exhaust blower for this room and I was thinking of just using a 200CFM for the veg room as well even though it is a little over sized for the vegetative room considering it is 5x9x7 which = 315, 315/5= 63CFM required

I will cut a hole in each room for intake air near the bottom or each room to allow for clean air intake from my basement. I am wondering how I should do the exhaust though...

Should I run the exhaust fans only for the lights or should I exhaust the whole room? Will the 200CFM fan keep 2, 1000 watt lights from heating my room to much if I just use the exhaust fan in the ceiling of my room vented outside through a carbon filter with out attaching any vent tubes to the light hoods? or should i vent the lights with the 200CFM fan and run a separate fan for the room itself or does that not even matter if I am venting the lights through the attachments on the hoods? I am confused on how to do this while being as efficient as I can with my money without sacrificing quality and yield.

Any advice on how to run the exhaust and maybe which fans/blowers you pros have had experience with. I am looking to keep it quiet, obviously so I was looking at the Vortec brand as they seem to be well known.

Please help where you can and thanks in advance RIU...
 

desertrat

Well-Known Member
9x9x7 = 567 divide by 5 for the amount of time it should take to clean the room = 113.4 CFM required
this formula is good only to let you know how much fresh air to bring in to have adequate levels of co2. the formula does not account for how much air you need for cooling. you need up to two air exchanges a minute (10x your estimate) for cooling. for instance, i have one 440 cfm fan cooling one 600 watt light and exhausting air from a 540 cubic foot room - just under one air exchange per minute.

Should I run the exhaust fans only for the lights or should I exhaust the whole room?
two basic technigues: 1. bring in air from outside the room to cool the lights then duct the air out of the room without ever mixing with room air. you need a separate room exhaust if you do this. 2. from inside the room, go carbon filter-->fan-->duct-->light1-->light2-->duct-->exhaust.
 
If you have the extra dough for 2 fans will be best.
1 for the light hoods and 1 for the room then connect a y pipe to the carbon filter out that would be best it will be quiet, no smell and very efficient your room temp will awesome.
But if your only running 1 fan I would suggest running tubes from the lights connected to the fans then out to the carbon filter it will take the heat and smell at the same time but you might have a heat problem since your running 2 1000 watts with one 200 CFM exhaust, I would suggest running a 400 or 600 CFM if you were to run only one vortec fan
PS the bigger you fan the less vibration there will be hence less noise
cheers happy growing
 
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