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Two tents one exhaust out

  • Thread starter Thread starter Natep
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Two tents one exhaust out

Natep 19 Replies 2,472 Views
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Natep

Natep

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#1
Guys I’m having a problem with my new tent. Both tents are 2x4 with 4” acinfinity fans model 69 controller. Only difference in the two setups are one has an ion frame evo 3 other has two of the small ion grids. I have both in-line fans teed together and venting out of the side of the house. I add
 
#2
What's the issue with it?

Duct lengths the same?
 
#3
i bet the problem is 1 tent is a degree or 2 hotter then the other tent
 
#5
Natep said:
Exactly. Then I watch the fan start coming up and the walls of the tent don’t suck in. So I know it’s not moving air.
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i got 2 4x4 side by side there is a 2 degree difference in them most the time
 
#6
Natep said:
Guys I’m having a problem with my new tent. Both tents are 2x4 with 4” acinfinity fans model 69 controller. Only difference in the two setups are one has an ion frame evo 3 other has two of the small ion grids. I have both in-line fans teed together and venting out of the side of the house. I add
Click to expand...
unless the ducting you have both exhaust blowing into is big enough to handle the volume of air being pushed through it it most likely working against you
 
#7
One 4" is not anywhere near enough fan for two tents. All these exhaust fans rated cfm is without hose/duct or carbon filters installed. Just the fan,,, nothing more. So your fresh air intake openings in the tents, flex hose and carbon filters either induce head or increase pressure drop across the fan and destroy performance and fan curve. I worked with this stuff for 30 years. Fans, blowers, pumps, ducting, pipe, measurement and controls. Engineering, design, bid/spec, sales, install, setup, commissioning, warranty and parts. Everything but the accounting. Open up all the vent panels you can or access sleeves to your tents that are practical. Keep your flex duct runs as short as possible and as straight as possible. If you end up with radius keep them sweeping and smooth and if you use a carbon filter always put it on the exhaust side of the fan so one can capitalize on inducing head pressure to get the air through the filter. If you put a carbon filter on the suction side of the blower you immediately destroy the performance of the blower/pump by lowering it's ability to make differential pressure.
 
#8
Blastfact said:
One 4" is not anywhere near enough fan for two tents. All these exhaust fans rated cfm is without hose/duct or carbon filters installed. Just the fan,,, nothing more. So your fresh air intake openings in the tents, flex hose and carbon filters either induce head or increase pressure drop across the fan and destroy performance and fan curve. I worked with this stuff for 30 years. Fans, blowers, pumps, ducting, pipe, measurement and controls. Engineering, design, bid/spec, sales, install, setup, commissioning, warranty and parts. Everything but the accounting. Open up all the vent panels you can or access sleeves to your tents that are practical. Keep your flex duct runs as short as possible and as straight as possible. If you end up with radius keep them sweeping and smooth and if you use a carbon filter always put it on the exhaust side of the fan so one can capitalize on inducing head pressure to get the air through the filter. If you put a carbon filter on the suction side of the blower you immediately destroy the performance of the blower/pump by lowering it's ability to make differential pressure.
Click to expand...
2-4” fans tee together 1 6” out. I do not run carbon filters. I’m a plumber for a huge mechanical contractor. But I can really go to our engineers with this.
 
#9
im not sure what a degree or 2 would matter anyway at least i hope it does not matter for my tents lol any chance your just over thinking it
 
#10
budsofgeorgia said:
im not sure what a degree or 2 would matter anyway at least i hope it does not matter for my tents lol any chance your just over thinking it
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I'm not sure the 2 degree difference is his biggest concern, I think it's more that the tent is showing no negative pressure and not cycling fresh air into the tent properly.
 
#11
How hard would it be to swap each tent fan with each other? If the issue changes tents, then there's an issue with the fan itself.

What does increasing fan speed on the tent with issues do?

Are you using a straight tee or a Y?
If it's a straight tee and the exhaust from each is directed directly at each other, it's possible that 1 fan is pushing back on the other, slowing it down. It could be doing that because 1 fan is a little faster then the other at the same speed.
It could still happen with a Y but less chance then with a T.
 

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#12
just fill the air movement at the end of the ducting coming from that tent
 
#13
budsofgeorgia said:
just fill the air movement at the end of the ducting coming from that tent
Click to expand...
Of course there's ways around it but if he is anything like me, he wants to know why it isn't working right.
I know it would drive me a little crazy lol
 
#14
i have thought about doing this one before , but i was thinking the single air line going out would have to be bigger so it would be able to handle the air flow of the 2 coming in
1725566364116
 
#15
I ran 2 4” into one 6” out. When the one fan is ramped up higher than the other due to higher temps in on tent than the other it puts pressure on the back draft dampener and does let any flow out of the other tent. I think I am going to be forced to cut another hole in the side of my house to bring out a separate exhaust from each tent. Just didn’t really want to cut another hole.
 
#16
Newty said:
How hard would it be to swap each tent fan with each other? If the issue changes tents, then there's an issue with the fan itself.

What does increasing fan speed on the tent with issues do?

Are you using a straight tee or a Y?
If it's a straight tee and the exhaust from each is directed directly at each other, it's possible that 1 fan is pushing back on the other, slowing it down. It could be doing that because 1 fan is a little faster then the other at the same speed.
It could still happen with a Y but less chance then with a T.
Click to expand...
Fan moves air when I disconnect the duct or ramp them up manually to equal flows. You can tell when it stops moving air. The walls don’t get sucked in.
 
#17
Natep said:
I ran 2 4” into one 6” out. When the one fan is ramped up higher than the other due to higher temps in on tent than the other it puts pressure on the back draft dampener and does let any flow out of the other tent. I think I am going to be forced to cut another hole in the side of my house to bring out a separate exhaust from each tent. Just didn’t really want to cut another hole.
Click to expand...

Natep said:
Fan moves air when I disconnect the duct or ramp them up manually to equal flows. You can tell when it stops moving air. The walls don’t get sucked in.
Click to expand...
I wasn't sure exactly how it was setup, was just trying to throw some ideas out there. Idk if doubling the size would do anything, running two 4" into one 8" instead if a 6".

Did you try without the dampener? Idk if the higher fan speed would push air into the tent with the slower fan speed or if it would just keep flowing out the way it should.

Another thought would be to daisy chain the fans and have only 1 Controller 69 control both fans, they would always run at the same speed then.
Idk if that would make the other tent hotter or colder and be an issue if 1 tent is in veg and the other in flower or something.

I don't like to exhaust into my lung room but with the setup I bought for the 1 gallon challenge, I ended up exhausting it right into the lung room. I will eventually run it like the other 2 tents exhaust but I just didn't want to cut another hole in the wall right now. I'll end up doing it before winter.
 
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#18
budsofgeorgia said:
i have thought about doing this one before , but i was thinking the single air line going out would have to be bigger so it would be able to handle the air flow of the 2 coming in
View attachment 2266386
Click to expand...
Yeah, I agree the outlet should be bigger then the 2 inlets.
I just found a picture to use as an example, wasn't meant to be 100% accurate lol.
 
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