Walls of my tent pushing out instead of sucking in

NukaKola

NukaKola

Well-Known Member
Rollitupwarrior said:
Hey, so I recently purchased 2 new 4 inch in-line fans to add to my 4x4 tent. I already had one set up for extraction but it was a bit larger and didn’t come with a wall mount so I swapped it for the littler new one with the wall mount. Even though it states they’re the same rpm the smaller one feels a bit weaker.

so the setup currently uses both of the new fans which are the exact same, one for intake and one for outtake. 2 fans on the canopy and a small fan on the floor of the tent. I noticed that when I swapped out the larger extraction fan for the small one the walls of the tent started to push out instead of sucking in.
Is it recommended to run a larger extraction fan than the intake fan so that this doesn’t happen or is it nothing to worry about?
I was thinking it could possibly be from the other 3 fans inside the tent too?
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RPM is only how fast the fan is spinning, that along with the diameter is what determines the CFM, or how much air the fan moves. A 4” fan running at higher RPM can move less air then a 6” fan running at lower RPM. This is why many people choose to get a larger fan than is actually needed so it can be slowed down with a speed controller which further reduces the noise and will still provide enough air.

If you use both 4” fans for intake and exhaust, put the intake fan on a speed controller and slow it down a little until you get negative pressure.
 
Ou8aCracker2

Ou8aCracker2

Well-Known Member
When running active exhaust/active intake it is important to use an intake fan that is rated less cfm than the exhaust fan, so you'll need to buy a speed controler and attach that to your intake fan.
 
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