400w Cool Tube exhaust

7th1der

7th1der

Well-Known Member
What type of fan should I use to exhaust the heat from a 400w HPS bulb?

I wanted to do a PC fan but the bigger the CFM the bigger the noise, right?
 
BigBudBalls

BigBudBalls

Well-Known Member
I have a 293/218 CFM fan (fast/sow speed) Connected to a hood. I keep it on slow speed and I can keep my hand on the glass as long as I like. Top of hood is room temp.

Its not a cooltube, but should give you an idea.

Oh I push through. Keeps the fan cooler and more air molecules to absorb heat in the hood.
 
7th1der

7th1der

Well-Known Member
BigBudBalls said:
I have a 293/218 CFM fan (fast/sow speed) Connected to a hood. I keep it on slow speed and I can keep my hand on the glass as long as I like. Top of hood is room temp.

Its not a cooltube, but should give you an idea.

Oh I push through. Keeps the fan cooler and more air molecules to absorb heat in the hood.
Click to expand...

Okay, sound good! I wanted to pull because the cords will be fed through the other hole closest to the ceramic socket. Or I could always cut a hole to feed the cords through, but wouldn't that take away pressure? Also, is it better to cut holes for the cool tube one in the back and one in the top or both in the back?
 
BigBudBalls

BigBudBalls

Well-Known Member
7th1der said:
Okay, sound good! I wanted to pull because the cords will be fed through the other hole closest to the ceramic socket. Or I could always cut a hole to feed the cords through, but wouldn't that take away pressure? Also, is it better to cut holes for the cool tube one in the back and one in the top or both in the back?
Click to expand...
Push vs pull has bee debated all to much. It really doesn't matter. Though some fan style work better one way over the other.

You really don't want to cool your tube with the grow room air. It can be done and has, but not the best solution.
You want the straightest path. Least bends, angles etc. I have a 90 right after the hood, and still cools just fine, so go figure.
 
7th1der

7th1der

Well-Known Member
BigBudBalls said:
Push vs pull has bee debated all to much. It really doesn't matter. Though some fan style work better one way over the other.

You really don't want to cool your tube with the grow room air. It can be done and has, but not the best solution.
You want the straightest path. Least bends, angles etc. I have a 90 right after the hood, and still cools just fine, so go figure.
Click to expand...
sounds good! So in that case, should I drill the holes on the sides? I have this bitch ass PC fan that I knew was not strong enough when I bough tit but I was pressed to try out the wiring diagram I saw on here. My seeds are cracking and I want to put them in the cab asap.. Do you think It will be too hot in there for seedlings just with that little bit of air flow? Just went to Lowes and those fuckers don't even sell duct fans.

Exactly how many CFM's is necessary to cool a 400w HPS Cool Tube in a 16 sq ft cabinet? The distance isnt even that long cause the cab isnt but so wide.

SORRY FOR BEING A PAIN IN THE ASS!
​
 
N

notyourkind

Well-Known Member
When i read Big Bud Balls' posts, I hear Bubbles' voice in my head everytime! Without Fail!

OK. Sorry to interrupt - back to the 400w CoolTube post..
 
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