difference in fans?

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doingfine

Well-Known Member
honest opinion from everyone what do you think the difference is between say a 300 to 400 cfm fan from home depot for usually what the use for the bathrooms compared to the 300 to 400 cfm inline fans with the exception of vortex cause they are too expensive
and its goin in a 4 by 3 by 8 ft room that i cant get the temp under 90 to 95 when the 600w light is on, when its off its about 70 to 75
any help would be great
only cause my setup already has a bathroom fan built in and would be easier just to swap it out rather than redoing it just my fan now is only like 30 cfm
thanks guys
 
xXOnyxXx

xXOnyxXx

Well-Known Member
is your HID have a inline fan system to cool it? .. in that size room its gonna be a must have .. i use a 485cfm 6" inline going through my hood .. my temps run about 78 to 80 with lights on and like 70 with em off ... try to run a fan blowing right on the light at a upward angle if you're using a open reflector, that along with your idea would possibly work. hope ya get it solved :)
 
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cruzer101

Well-Known Member
It depends on the intake and how you cool your light.
If you can supply a decent amount of air from outside to the lower part of your grow area then an even smaller bathroom fan will work.
I got a 2 by 4 by 6 foot cabinet I run 400w in a cool tube. The fan for the diy cool tube is a simple 4"duct fan 110 cfm mounted right to the light. The exhaust fan is one of those Panasonic whisper fans, only rated at 80 cfm but really moves the air. I run my lights at night and have no heat issues even during summer when it 90° daytime cause it cools at night and I am drawing the air from under the house.

So if you got a good intake of cool air it makes a big difference.

I think the biggest bang for your buck is a inline duct booster fan.
They make 8 in that push like 500 cfm for like $50
 
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doingfine

Well-Known Member
cruzer101 said:
It depends on the intake and how you cool your light.
If you can supply a decent amount of air from outside to the lower part of your grow area then an even smaller bathroom fan will work.
I got a 2 by 4 by 6 foot cabinet I run 400w in a cool tube. The fan for the diy cool tube is a simple 4"duct fan 110 cfm mounted right to the light. The exhaust fan is one of those Panasonic whisper fans, only rated at 80 cfm but really moves the air. I run my lights at night and have no heat issues even during summer when it 90° daytime cause it cools at night and I am drawing the air from under the house.

So if you got a good intake of cool air it makes a big difference.

I think the biggest bang for your buck is a inline duct booster fan.
They make 8 in that push like 500 cfm for like $50
Click to expand...
i can never find one that cheap do you have a link?
by the way what do you mean by air in the bottom what if i put one of those square fand on the ground will that work?
i am running a fan on the lamp in an upwards position
 
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doingfine

Well-Known Member
ok i found them they are pretty cheap if i were to grab one of those and put like i said a fan on the ground do you rhink that will work just fine?
i even found a 700 cfm fan cheap
 
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cruzer101

Well-Known Member
See what I mean. Best bang for your buck, If you run them constantly you still get at least two years out of them.
what I meant for intake was to cut a hole in the floor boards. cut it the same size as a heater register and put one on it.
Then you will have all the cool air you will ever need. The put the exhaust out the center of the top and you are golden.

If you cant cut a hole like that then duct your outside air into the bottom of the cabinet and boost with a 6 in duct fan with an 8 in going out for exhaust. For the light, enclose it and run a second ducting, 4 in this time with a 4 in duct fan pushing air across the light and outside.

Run lights at night and that should do it for under $100
 
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doingfine

Well-Known Member
cruzer101 said:
See what I mean. Best bang for your buck, If you run them constantly you still get at least two years out of them.
what I meant for intake was to cut a hole in the floor boards. cut it the same size as a heater register and put one on it.
Then you will have all the cool air you will ever need. The put the exhaust out the center of the top and you are golden.

If you cant cut a hole like that then duct your outside air into the bottom of the cabinet and boost with a 6 in duct fan with an 8 in going out for exhaust. For the light, enclose it and run a second ducting, 4 in this time with a 4 in duct fan pushing air across the light and outside.

Run lights at night and that should do it for under $100
Click to expand...
let me ask you this question my grow and bloom rooms are together seperated between by a wall, what if i made a square hole in the bottom of that wall and put one of those smaller square wall fans in it bringing the air from the grow room into the bloom room which whill be vented with the duct fan?
this way it helps take some hot air out of the grow room at the same time
would that work for what you mean?
 
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cruzer101

Well-Known Member
Yeah, that would be one way of doing it, cool intake at the bottom and exhaust at the top.
Guess it depends on if the air in the grow room stays cool enough.
 
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doingfine

Well-Known Member
cruzer101 said:
Yeah, that would be one way of doing it, cool intake at the bottom and exhaust at the top.
Guess it depends on if the air in the grow room stays cool enough.
Click to expand...
the air in the grow room is 80 when lights on and 70 when lights off
is that ok?
 
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cruzer101

Well-Known Member
So you got a ten degree difference between rooms when lights on both rooms but 20 when lights are off in the veg room.
Well then I would say cut your vegging to 16 hours and flower when veg room light is ending. Start flowering room at 8pm to 8am, start veg room 8am off 12pm off. I think that would make the best use of the cooler air.
 
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doingfine

Well-Known Member
cruzer101 said:
So you got a ten degree difference between rooms when lights on both rooms but 20 when lights are off in the veg room.
Well then I would say cut your vegging to 16 hours and flower when veg room light is ending. Start flowering room at 8pm to 8am, start veg room 8am off 12pm off. I think that would make the best use of the cooler a


you think i could use a couple of cpu fans to blow the air through? you think thats enough power?
Click to expand...
 
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cruzer101

Well-Known Member
nope. not enough, you need to move air man. You either need a big hole like 4 in by 12 inches or a decent fan. If it don't mater what it looks like use a duct fan, cut a hole and stick it in there. If you need it to look nice get a through the wall utility fan. Here is a link to one. LINK
 
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doingfine

Well-Known Member
cruzer101 said:
nope. not enough, you need to move air man. You either need a big hole like 4 in by 12 inches or a decent fan. If it don't mater what it looks like use a duct fan, cut a hole and stick it in there. If you need it to look nice get a through the wall utility fan. Here is a link to one. LINK
Click to expand...
im trying to be cost efficent for now i gotta buy the duct fan, i was wondering what if i cut a hole out the size of one of my circular fans and mount that in the wall?
i have a couple pretty strong circular rotary fans
 
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