Intake/Exhaust Ratio

H

history101

Member
What is the ideal ratio of intake to exhaust fans?

For my micro grow-box, currently I plan on two 88mm intakes and a 76mm exhaust. since I'm going to be cutting into my mini-fridge I thought I might as well make the most of it and put as many fans as possible.

Also, the exhaust fan is inside the unit. Will I get a stronger suction if I stack another exhaust fan "on-top of" the current one? Or at least an equal exhaust/intake ratio?

https://www.rollitup.org/grow-room-design-setup/334571-mini-fridge-grow-box-currently.html
 
jesus of Cannabis

jesus of Cannabis

:-)
i have my exhaust in a room then I close the door and light a candle in an hour or so. Put the flame near the bottom of the door, if the flame wants to go under the door, because of the good exhaust, than you have your ratio.
 
wallycork

wallycork

Well-Known Member
history101 said:
What is the ideal ratio of intake to exhaust fans?

For my micro grow-box, currently I plan on two 88mm intakes and a 76mm exhaust. since I'm going to be cutting into my mini-fridge I thought I might as well make the most of it and put as many fans as possible.

Also, the exhaust fan is inside the unit. Will I get a stronger suction if I stack another exhaust fan "on-top of" the current one? Or at least an equal exhaust/intake ratio?

https://www.rollitup.org/grow-room-design-setup/334571-mini-fridge-grow-box-currently.html
Click to expand...
Id switch the intake to the 76 mm and the exhaust to the 88mm. I always thought it better to have the hot air being expelled by the more powerful fan.
 
H

history101

Member
What about stacking two exhaust fans on top of each other?

The 76mm exhaust is in a hard to reach place, I was thinking that if I just slapped another fan on top of it things would be a-okay?

proposedexhaust.jpg
The red line indicates where I would stick a bigger fan like an 88mm or a 120mm. Since the 76mm is inside of the unit, could I just slip a bigger fan onto that open space and get more exhaust out of the same hole?
 
wallycork

wallycork

Well-Known Member
history101 said:
What about stacking two exhaust fans on top of each other?

The 76mm exhaust is in a hard to reach place, I was thinking that if I just slapped another fan on top of it things would be a-okay?

View attachment 960630
The red line indicates where I would stick a bigger fan like an 88mm or a 120mm. Since the 76mm is inside of the unit, could I just slip a bigger fan onto that open space and get more exhaust out of the same hole?
Click to expand...
Ya you could do that, might be a bit of overkill, what i just thought after seeing that picture is that you could place an activated carbon pad (the square ones for a fist tank filter)
between you 2 exhausts and this might reduce any smell

I know you didnt ask about it but the thought just came into my head.
But dont see a prob with stacking them, could be useful to change temps, one on one off, or 2 on for hot days
 
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