Lowest allowable air temp for cool tubes?

brewster81

brewster81

Well-Known Member
I've been contemplating how to run my airflow for my cool tubes. I know ideally you would bring in outside air through the cool tubes, but what happens when it's say minus thirty to forty degrees Celsius outside? Is that air going to be too cold and what kind of problems would cause? The air will never see the inside of the grow room.
 
brewster81

brewster81

Well-Known Member
Velvet Elvis said:
too cold, cracked bulbs, inefficient ouput
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That's kind of what I thought. Would drawing air from an adjacent room and exhausting outside be a good option? Or drawing air through carbon filter in grow room and exhausting outside? Which would be better in your opinion?
 
Velvet Elvis

Velvet Elvis

Well-Known Member
through filter to light to outside, and an intake from adjacent room.

carbon will leave a dust film inside cool tube, it takes months though.
 
A

anzohaze

Well-Known Member
If outsode gets that cold it would prob blow stwam the whole time get a small fan so it barely moves air like a computer fan to slighltly blow cold air onto bulb so itnactually comes put warmer on exhaust side
 
Mainlinekush

Mainlinekush

Well-Known Member
If temps become more or less than what you want try a thermostat controller on your fans it cuts on and off holding temps within 3 degrees all the time.
 
brewster81

brewster81

Well-Known Member
You guys have any idea as how to run your ventilation from my 8" cool tube through the ceiling then to a roof vent? I'm trying to avoid just using a piece of flex duct going through a hole in the ceiling. Is there not some kind of ducting piece I could buy that would act as a flange in the ceiling? Where I could run a piece of flex duct from my light to the flange in the roof and then another piece of flex duct from the other side of the flange in the attic to the roof vent? There must be something out there like this, but I don't know what to call it or to ask for?
 
VX420

VX420

Active Member
brewster81 said:
You guys have any idea as how to run your ventilation from my 8" cool tube through the ceiling then to a roof vent? I'm trying to avoid just using a piece of flex duct going through a hole in the ceiling. Is there not some kind of ducting piece I could buy that would act as a flange in the ceiling? Where I could run a piece of flex duct from my light to the flange in the roof and then another piece of flex duct from the other side of the flange in the attic to the roof vent? There must be something out there like this, but I don't know what to call it or to ask for?
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Most of the time, your home has plenty of roof vents to let the attic breath. I would simply vent into the attic and be done with it.. In fact I would vent with my cool tube open on the intake end and not use a Filter (, its going into the attic anyway)
 
G

gucio19

Member
In the past I used 4 aircooled 600 Watts. When outside was cold ( about 2-8 'C) I got condensation on non insulated elements, like Y splinter or fan housing. But nothing inside ducts(insulated) or cooltubes. Then I disconnected duct and use room air to cool lamps and heat my grow area:)
 
brewster81

brewster81

Well-Known Member
All awesome replies and greatly appreciated. I'm going to try venting into the attic Over the winter keeping an eye out for ice damming and a bunch of moisture in the attic. If I need to I can easily install a vent on the roof and run the extra piece of flex to it. There's plenty of ventilation in my attic. I'm thinking it'll be no problem.
 
SnapsProvolone

SnapsProvolone

Well-Known Member
Dewpoint. Don't vent warm humid air into a cool attic or at least plan on black mold. That warm air hits the under side of the plywood sheathing and it's like a bathroom mirror and a hot shower..
 
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