Negative pressure tent - advice needed

Canadain Closet Gardener · Mar 12, 2018

Because my tent is in closet I can use a hook attached to the wall to hold one wall of my tent wider. Alligator Clips were cheap off of ebay 10 for like $2

Cheers
CCG

Zero_OS · Mar 12, 2018

Good deal. Looks to be a nice grow...subbed on your grow journal

Zero_OS · Mar 12, 2018

that's whats cool about this hobby, everyone problem-solves based on their set of conditions and access to materials.

drsaltzman · Mar 12, 2018

JacksonJ said:
Thats probably the easiest way to handle it. That other way above is nice, but overthought in my opinion. my tent has a little window on the bottom with a screen. I leave that open all the time ( I also laugh at all the conversations about light leaks too due to that) and that evens the pressure.

That's correct.
Opening the bottom flap passive intake is all that's required.
Kill the intake fan. Open the flap. You'll have instant equal pressure.
If light leaking in is a problem, build a light trap.
Or just face the intake to a wall.

Zero_OS · Mar 13, 2018

drsaltzman said:
...You'll have instant equal pressure.

I've tried this with my setup and there was still neg pressure because the fan is active and draws way more than can passively flow through the meshed openings.

drsaltzman said:
...If light leaking in is a problem, build a light trap.

Good advice, added to the to do list.

Potmetal · Mar 14, 2018

JacksonJ said:
Thats probably the easiest way to handle it. That other way above is nice, but overthought in my opinion. my tent has a little window on the bottom with a screen. I leave that open all the time ( I also laugh at all the conversations about light leaks too due to that) and that evens the pressure.

Same. I didn't put the tent into a "well lighted room". I put it a dark space. Open as much of any little window as I need to balance my grow. It's basic tuning between the active intake and exhaust, as well as a passive (if needed, like me). It is done by folks everyday, like me!

But ultimately, it's a design flaw.

kingtitan · Mar 14, 2018

Glenkush said:
You could get a fan controller and reduce exhaut fan until it pull less on the side but not too much so you wont loose neg pressure... Or you could add more "crossframe" between the vertical tubes. You can take a pvc pipe two hole at the end and tie wrap it to the vertical tube if you see what i mean?

I Have an home made tent wich the front is about 5x5' and it has no crossframe. The wall suck in about 2inch... but the exhaust fan is not that powerfull but enough to create neg. pressure.

Yup get some cheap electrical condiut and crossframe, all you need is duct tape. nothing fancy

boostedhonda · Mar 15, 2018

U don’t need an intake fan when u have negative pressure. IMO a four inch fan is more than enough for a 4x4, I have a 4” on a 4x4 with the fan turned all the way down and have just enough negative pressure where the sides don’t suck in much

Negative pressure tent - advice needed

Canadain Closet Gardener

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Zero_OS

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Zero_OS

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drsaltzman

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Zero_OS

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Potmetal

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kingtitan

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boostedhonda

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