Using INLINE Fan

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dizzyground

Well-Known Member
I have never used an inline fan before. My plan was to hook it to fresh air from outside, but to turn off the fan during night. So there will be air passing the fan passively. Is this ok to do or can it damage my prima klima 120mm fan?

Other pro tips about how to use inline fan also appreciated.

Got 160mm exhaust going out, need to boost the intake, passive is not enough.
 
LeastExpectedGrower

LeastExpectedGrower

Well-Known Member
You can do that for an intake, and letting air pass while the fan isn't running won't hurt the fan...but I'd worry about your plants. I'm not sure of the wisdom of allowing 'very cold and wet, even below freezing' air in your grow. At the worst, it'll harm your plants...or you may have condensation issues in your tent.
 
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dizzyground

Well-Known Member
LeastExpectedGrower said:
You can do that for an intake, and letting air pass while the fan isn't running won't hurt the fan...but I'd worry about your plants. I'm not sure of the wisdom of allowing 'very cold and wet, even below freezing' air in your grow. At the worst, it'll harm your plants...or you may have condensation issues in your tent.
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Thanks for tip.
Yeah maybe intake fan is not needed anymore when air gets super cold. But for now.

Three Berries said:
Smaller intake than exhaust will really cut the exhaust efficiency. Should be the other way around.
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I want vacuum. Actually never used intake fan before. But dont need max efficiency with outside temps maxing 10c atm.
 
LeastExpectedGrower

LeastExpectedGrower

Well-Known Member
dizzyground said:
Thanks for tip.
Yeah maybe intake fan is not needed anymore when air gets super cold. But for now.



I want vacuum. Actually never used intake fan before. But dont need max efficiency with outside temps maxing 10c atm.
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My intake while the same size as my exhaust doesn't pull as much air...I have it damped down so there's less flow. You'd think you'd have a balanced system with matching fans, but you actually want your intake to pull it a bit less than your exhaust to keep slightly negative pressure. If your exhaust fan has a filter, it's not pulling it's full CFM anyway. Generally speaking people size down or speed-down their intake a bit from the exhaust.
 
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dizzyground

Well-Known Member
LeastExpectedGrower said:
My intake while the same size as my exhaust doesn't pull as much air...I have it damped down so there's less flow. You'd think you'd have a balanced system with matching fans, but you actually want your intake to pull it a bit less than your exhaust to keep slightly negative pressure. If your exhaust fan has a filter, it's not pulling it's full CFM anyway. Generally speaking people size down or speed-down their intake a bit from the exhaust.
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Yeah this is my plan. Im gonna run my ~200cfm (400m3h), i tried it without any ducting and probably 10% is enough that way for now, 20% would be plenty :D
 
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dizzyground

Well-Known Member
Also if other people are interested in this topic I fount this info on growland.biz
"In cold temperatures, plastic that is often used is generally suitable because it cannot freeze."
They are selling full line of prima klima exhaust fans.
 
LeastExpectedGrower

LeastExpectedGrower

Well-Known Member
My exhaust goes by about 4' of duct outdoors and we get well below freezing too. I ended up putting a duct damper on the end of that run so that if my fan controller triggers it down to off (or there's a power outage), the damper closes and the cold air can't funnel into my room.
 
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