air cooled hoods...

Phinxter

Well-Known Member
i think you can make this work with the fans you have but the problem as i see it is that you are dumping the exhaust air from you cool tube into the room you intake your air from which is raising the ambient temp of your intake air to 75+ degrees

what i do is dump my exhaust air from my cool tube out a dryer vent to outside.
since its never actually been ni the grow room it has no smell and can safely be dumped outside.
this in turn should help lower your intake air and inturn lower your grow room temps
i manage to hold 76 degrees in a 40" X 40" X 79" tent with a 1000watt MH by exhausting my cool tube in exactly the way described keeping my inlet air at 73 degrees
 

predator0187

Well-Known Member
i think you can make this work with the fans you have but the problem as i see it is that you are dumping the exhaust air from you cool tube into the room you intake your air from which is raising the ambient temp of your intake air to 75+ degrees

what i do is dump my exhaust air from my cool tube out a dryer vent to outside.
since its never actually been ni the grow room it has no smell and can safely be dumped outside.
this in turn should help lower your intake air and inturn lower your grow room temps
i manage to hold 76 degrees in a 40" X 40" X 79" tent with a 1000watt MH by exhausting my cool tube in exactly the way described keeping my inlet air at 73 degrees
Well my air going into the hood is coming from the same room it is on a different end of my basement. The air it is pulling in is about 75F and vents to the opposite side of the room. Both my intake for my room and the intake for the fan are 75F going in, but the damn light is so hot it heats the room right up.
Like I said I have a 110CFM fan cooling my room, a 110CFM fan exhausting the hot air out, a 110CFM blowing into my fan and another bathroom vent blowing onto the fan blowing into my light....lol sounds funny, I have another bathroom vent that is 60 CFM but I thought it would be useless...:weed:
 

predator0187

Well-Known Member
You have a room that ios 4x3x4, with a 300 cfm lfan blowing air into and out of the light, and another 300 cfm fan blowing air into that room, y9ou will still have trouble with heat. that room is just to small for that wattage of light. But,, BUT,, you can make it work with about $500 worth o-f fans an ducting. Boost up the CFM on the light to 405 vortex, and a 495 vortex puching air back in. this should fix the heat trouble. But each fan is about $250. Plus all the ducting and such items.
A little too much for fans right now, got a wife and kids, and already dropped too much money in my grow room. It is only small for now, I have to develop my basement and I'll have a bigger room, but This room needs to work for a couple months:lol:
 

mane2008

Well-Known Member
A little too much for fans right now, got a wife and kids, and already dropped too much money in my grow room. It is only small for now, I have to develop my basement and I'll have a bigger room, but This room needs to work for a couple months:lol:

you can get a nice 6in one for $130
its the cheapest inline fan i know of.
they have the duct booster but they are inefficient and noisy and you dont want noisy.

check out that site i showed you.
 

Phinxter

Well-Known Member
i use a 6 inch inline fan to inlet air to my cool tube and another to boost the exhaust but only becaus i have a 25 foot outlet duct.
the 6 inch inline fan runs about 250cfm. so you may want to up your fan to about that.
the 250cfm keeps the glass cool enough that i can keep my hand within an inch of it very comfortably and probably would not be instantly burned if i touched the glass directly.
any more than 250 cfm will obviously only help but im not sure its neccesary
 

predator0187

Well-Known Member
i use a 6 inch inline fan to inlet air to my cool tube and another to boost the exhaust but only becaus i have a 25 foot outlet duct.
the 6 inch inline fan runs about 250cfm. so you may want to up your fan to about that.
the 250cfm keeps the glass cool enough that i can keep my hand within an inch of it very comfortably and probably would not be instantly burned if i touched the glass directly.
any more than 250 cfm will obviously only help but im not sure its neccesary
Well see thats the thing, I can without a problem touch the glass and leave my hand on it without feeling uncomfortable, which is weird I know. But the heat is still in the room. I can feel the heat to a point when I put my hand in direct light, but there is never a moment when my hand is "too hot."
As far as I am concerned the glass is cooler and only hits mid 90's on the actual glass.
 

Phinxter

Well-Known Member
sounds like your are cooling the hood as well as you can in which case i might add a bit more exhaust and use passive intake.
wish i could help a bit more but it sounds like your cool tube is working quite well considering
 

predator0187

Well-Known Member
sounds like your are cooling the hood as well as you can in which case i might add a bit more exhaust and use passive intake.
wish i could help a bit more but it sounds like your cool tube is working quite well considering
LOL That's what I thought, but like I said I am new at this whole thing. I would think a 110 CFM fan would be okay for my room as well. I would think Pulling in 110 CF of air in a room with a little over 40 feet would be okay, especially if the air coming in is 75F. But as I was saying 86 is the lowest I have seen an 96 is the highest.
I also have a 14" oscillating fan blowing the cold air coming from the intake to disperse it.
 

mane2008

Well-Known Member
90 is max and growth will be totally slow.
85 is truly the max of when you might be able to see stress
 

predator0187

Well-Known Member
90 is max and growth will be totally slow.
85 is truly the max of when you might be able to see stress

LOL shitty, guess I got to figure something out then hey?

I was looking on that website you gave me and yeah those look good. ever used one? do you know how noisy they are?
 

mane2008

Well-Known Member
yea i had a vortex but my dog fuckin chewed on the cord.
very quiet tho, esp compared to some fans.
if you do decide to get a inline fan thats the cheapest you can find.
 
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