Drying tent ventilation

Chrisz0825 · Nov 1, 2017

I'm in the process of setting up a dedicated drying tent. I'm planning on a 32"x32"x63" tent. Gonna keep the vent flaps open and throw a 4" inline fan up top to get some airflow. Question is, what cfm inline fan should I get? Or should I get a duct booster...something weaker. I have my eyes on a 203 cfm inline fan...would this be too much?

Sour Wreck · Nov 1, 2017

i'm no expert, but i use something similar. with temps of 75, my harvest is ready to jar in 4-5 days

grassy007 · Nov 1, 2017

I have same tent size and same 4" exhaust fan ducted at top. For my intake, I just used a 120mm computer fan and was able to attach it to the intake hood at the bottom. If you have a intake hood at the bottom, you can use the cinch straps to hold the fan. It actually puts in more air than my 4" exhaust fan can evacuate fully, but it's acceptable and less noisy for me than putting in another 4" intake fan with ducting to window.

coreywebster · Nov 2, 2017

Chrisz0825 said:
I'm in the process of setting up a dedicated drying tent. I'm planning on a 32"x32"x63" tent. Gonna keep the vent flaps open and throw a 4" inline fan up top to get some airflow. Question is, what cfm inline fan should I get? Or should I get a duct booster...something weaker. I have my eyes on a 203 cfm inline fan...would this be too much?

I don't think there is such a thing as too much in this situation. Your just exchanging air. The main thing is your not using a fan blowing directly onto your buds. A simple extraction and passive intake should mean a gentle breeze passes from bottom to top.
You can use a duct booster if you don't plan on filtering the air as it leaves the tent. If your going to use a carbon filter then use a proper inline fan.

McStrats · Nov 2, 2017

You don't need an intake fan. "makeup air" will happen all by itself because you have an exhaust fan.

Chrisz0825 · Nov 2, 2017

coreywebster said:
I don't think there is such a thing as too much in this situation. Your just exchanging air. The main thing is your not using a fan blowing directly onto your buds. A simple extraction and passive intake should mean a gentle breeze passes from bottom to top.
You an use a duct booster if you don't plan on filtering the air as it leaves the tent. If your going to use a carbon filter then use a proper inline fan.

I don't plan o

coreywebster said:
I don't think there is such a thing as too much in this situation. Your just exchanging air. The main thing is your not using a fan blowing directly onto your buds. A simple extraction and passive intake should mean a gentle breeze passes from bottom to top.
You an use a duct booster if you don't plan on filtering the air as it leaves the tent. If your going to use a carbon filter then use a proper inline fan.

Im not gonna be using a filter because I'm not too concerned about hiding the smell. So a duct booster it is. So you think I could use a small 100 cfm booster? Or should I go a little higher?

coreywebster · Nov 2, 2017

Yeah that should be fine.

Chrisz0825 · Nov 2, 2017

McStrats said:
You don't need an intake fan. "makeup air" will happen all by itself because you have an exhaust fan.

Exactly. Now I'm just trying to decide on what cfm duct booster for my sized drying tent

McStrats · Nov 2, 2017

Chrisz0825 said:
Exactly. Now I'm just trying to decide on what cfm duct booster for my sized drying tent

A 4" Centrifugal fan is good for about 180 cfm.

CFM (180) x 60 cu ft / Volume = 250 ach (air changes per hr) - but you only need about 15 ach for cannabis. Get the fan controller with the 4" centrifugal fan and run it barely cracked.

Chrisz0825 · Nov 2, 2017

McStrats said:
A 4" Centrifugal fan is good for about 180 cfm.

CFM (180) x 60 cu ft / Volume = 250 ach (air changes per hr) - but you only need about 15 ach for cannabis. Get the fan controller with the 4" centrifugal fan and run it barely cracked.

I actually have a spare fan controller laying around. Probably just get a 6 inch duct booster at 240 cfm and put that on low. I would rather have too much then not enough

McStrats · Nov 2, 2017

"CFM (180) x 60 cu ft / Volume" should have read "CFM (180) x 60 / Volume"

Drying tent ventilation

Chrisz0825

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Sour Wreck

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grassy007

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coreywebster

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McStrats

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Chrisz0825

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coreywebster

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Chrisz0825

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McStrats

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Chrisz0825

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