New Grower Exhaust creating too much negative pressure?

[Jsacc106]

Hey guys,
I just received an ipower 6in inline exhaust system kit for my 4x4x6.5' tent. I found that it doesn't have a fan control setting so it's just plug and go. It's a 443cfm fan. I recognized that after setting up and closing my tent, there's a very clear suction effect going on with my tent. When you look at the tent you can see how it's sucking it pretty noticeably. Now I do have a small fan blowing in creating an active intake but it's very weak compared to the exhaust so my question is....is there any negative issues with having a strong negative pressure system in the tent? There is not a strong breeze that could hurt the plants or anything actually it's hard to even see the plants moving from it. Just looks very odd when looking at the tent from the outside lol I bought an adaptable fan speed controller that goes in right at the socket so I will eventually have slow medium and high. Just wanted some opinions if I'm endangering my girls at all. All of which are still seedlings. Thanks!


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[The Botanist]

From what I read in my research you have too air being sucked out . Tent grow? Maybe ther is a flap that opens at the bottom to let cool air in aswell as your inlet fan, I had the opposite problem, mine ballooned out as I had to much fresh air in and the outlet fan connected to the carbon filter couldn't suck enough out but I've fixed that problem,I've a journal going on if ya fancy a look, good luck on your grow man

Edit: I believe for the tent in sucking in then that's far better that it ballooning out like mine, once ya manage the intake rate your sweet

 

[Jsacc106]

From what I read in my research you have too air being sucked out . Tent grow? Maybe ther is a flap that opens at the bottom to let cool air in aswell as your inlet fan, I had the opposite problem, mine ballooned out as I had to much fresh air in and the outlet fan connected to the carbon filter couldn't suck enough out but I've fixed that problem,I've a journal going on if ya fancy a look, good luck on your grow man

Edit: I believe for the tent in sucking in then that's far better that it ballooning out like mine, once ya manage the intake rate your sweet

Hey Botanist thanks for your reply! I couldn't think of how it would be negative for my plants but then again I'm brand new. I will have a look at your journal. The more info the better. Thanks again!


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[AutoWonders]

Hey guys,
I just received an ipower 6in inline exhaust system kit for my 4x4x6.5' tent. I found that it doesn't have a fan control setting so it's just plug and go. It's a 443cfm fan. I recognized that after setting up and closing my tent, there's a very clear suction effect going on with my tent. When you look at the tent you can see how it's sucking it pretty noticeably. Now I do have a small fan blowing in creating an active intake but it's very weak compared to the exhaust so my question is....is there any negative issues with having a strong negative pressure system in the tent? There is not a strong breeze that could hurt the plants or anything actually it's hard to even see the plants moving from it. Just looks very odd when looking at the tent from the outside lol I bought an adaptable fan speed controller that goes in right at the socket so I will eventually have slow medium and high. Just wanted some opinions if I'm endangering my girls at all. All of which are still seedlings. Thanks!


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That is negative pressure and is normal, especially when the inline fan is on high. You can always help that by connecting two bungee cords top to bottom on all four inside walls. I've done that for many years. When you get your speed controller, you will be fine. You can also use a variac controller, which gives you far more incremental speed adjustments.

You don't need a fan blowing into the tent if you have a port open at bottom opposite of extraction port and open one of the top cable ports. Plenty of air will be sucked in. What you do want is a 6" clip on fan inside the tent blowing over the tops of your plants. That helps promote strength in those little stems etc.

 

[Jsacc106]

That is negative pressure and is normal, especially when the inline fan is on high. You can always help that by connecting two bungee cords top to bottom on all four inside walls. I've done that for many years. When you get your speed controller, you will be fine. You can also use a variac controller, which gives you far more incremental speed adjustments.

You don't need a fan blowing into the tent if you have a port open at bottom opposite of extraction port and open one of the top cable ports. Plenty of air will be sucked in. What you do want is a 6" clip on fan inside the tent blowing over the tops of your plants. That helps promote strength in those little stems etc.

Thanks Auto! That's reassuring that the pressure should not cause an issue and you also answered my next question about a fan. I will put my small desk fan back in. I took it out at first assuming the exhaust would create a breeze but it really doesn't. Thanks again!


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[BII]

Rather than a speed controller which forces you to run the fan non-stop, consider a digital thermostat/electrical outlet. That way you have precise temperature control. I use a Lux WIN100. It turns on the circuit (exhaust fan) when the temp. goes 1˚F above set point and turns off when temp. reaches 1˚F below set point.

 

[Jsacc106]

Rather than a speed controller which forces you to run the fan non-stop, consider a digital thermostat/electrical outlet. That way you have precise temperature control. I use a Lux WIN100. It turns on the circuit (exhaust fan) when the temp. goes 1˚F above set point and turns off when temp. reaches 1˚F below set point.

Bll, I never considered that and is a great idea I will look into it. I'm just feeling a bit down right now and am praying I can keep these other girls alive and thriving


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[Micron Creek]

Hey guys,
I just received an ipower 6in inline exhaust system kit for my 4x4x6.5' tent. I found that it doesn't have a fan control setting so it's just plug and go. It's a 443cfm fan. I recognized that after setting up and closing my tent, there's a very clear suction effect going on with my tent. When you look at the tent you can see how it's sucking it pretty noticeably. Now I do have a small fan blowing in creating an active intake but it's very weak compared to the exhaust so my question is....is there any negative issues with having a strong negative pressure system in the tent? There is not a strong breeze that could hurt the plants or anything actually it's hard to even see the plants moving from it. Just looks very odd when looking at the tent from the outside lol I bought an adaptable fan speed controller that goes in right at the socket so I will eventually have slow medium and high. Just wanted some opinions if I'm endangering my girls at all. All of which are still seedlings. Thanks!


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Nothing wrong with negative pressure, air exchange is key and there is plenty. I think that it should extract just fine. Someone above already recommended keeping the sides restrained. That is a good suggestion.