Help!.....tooo Hot!!!!

[loolagigi]

ok, my closet is 4' wide 7 ' long, and 8' tall., last time i checked thats 224 cu'. so if i get a (224) cu' fan....it will pull that much air volume out of the closet in one minute......how many times a minute do i have to pull the air out to refresh and keep heat down from my hps? need to buy this weekend so any input would help... was thinking ecoplus 465....but a dealer said the ecoplus 265 blower......i dont know??????????????????

 

[donkeyballs]

get big fan and maybe a smaller light.

 

[Puff]

You have it right 400+ cfm per minute should cure the problem. I have 800w in a 5x5x8 and Im about 5 degrees warmer than the outside air. I would reccomend a sunleaves windtunnel. They are pretty quiet for their power. Plus FDD pointed out they have a polymer casing, which means that they are insulated from sound unlike metal housings. I went through 4 fans and if I would have just bought the sunleaves windtunnel first it would have saved me from doing 3x the work and spending twice the money. Just do it right the first time.

 

[loolagigi]

You have it right 400+ cfm per minute should cure the problem. I have 800w in a 5x5x8 and Im about 5 degrees warmer than the outside air. I would reccomend a sunleaves windtunnel. They are pretty quiet for their power. Plus FDD pointed out they have a polymer casing, which means that they are insulated from sound unlike metal housings. I went through 4 fans and if I would have just bought the sunleaves windtunnel first it would have saved me from doing 3x the work and spending twice the money. Just do it right the first time.

i cant afford the 400 plus windtunnel , but i can afford the ecoplus 465 and i can buy it locally, it will be mounted in my attic so sound should be ok.....i read that grow rooms could have air exchange once every three minutes, and now i am hearing 3 times a minute, whats the truth?

 

[Puff]

Well the truth is whatever the calclulations come out to on paper. You then double that and it gives you some room for error, say you have 10 feet of ducting (10% for each foot is lost), too many bends, air leaks, etc....

 

[loolagigi]

can anyone tell me is a ecoplus cage fan 265 or 465 enuff for a room my size with no bends and short ducting.................???????????????????????????????????????????????????

 

[loolagigi]

How to size your exhaust fan

There are many calculations on the web for sizing a fan for ventilating grow rooms; however, what these calculations fail to take into consideration is the friction loss on carbon filters, increased temperatures from HID lights and CO2, etc. The following calculation can be used as a guide for sizing an exhaust fan for a growing area (keep in mind that this calculation will give you the lowest required CFM required to ventilate the grow room):

Step 1 – Room Volume
First the volume of the room needs to be calculated. To calculate multiply length x width x height of growing area e.g. A room that is 8' x 8' x 8' will have a volume of 512 cubic feet.

Step 2 – CFM Required
The fan should be able to adequately exchange the air in a grow room once every three minutes. Therefore, 512 cubic feet/3 minutes = 171 cfm. This will be the absolute minimum cfm for exchanging the air in a grow room.

 

[Puff]

Step 2 – CFM Required
The fan should be able to adequately exchange the air in a grow room once every three minutes. Therefore, 512 cubic feet/3 minutes = 171 cfm. This will be the absolute minimum cfm for exchanging the air in a grow room.

Assuming you have no ducting that would work, but you cant have a fan without ducting. Once you calculate friction loss you need a lot more than the minimum.