I've thought, thought, and thoght some more. And I am completely out of options/suggestions. I mean when we cant cut, move, modify anything, what can one do ?

As I said before, the only efficent way to move air is you have an intake larger than your exhaust. Thats it, period, no ways around it, I understand thats not an option for you. So depending on how good that door seals is going to determine how much of a suction you create. Which is less than ideal. But, sometimes you got to make lemonade if handed lemons, so go for it.

At minimum I'd put a speed control on that fan so I could at least idle it back to keep from sucking all the lint, dust, and dirt into your grow area. And I dont care how clean your house is, you have dust, dirt, and lint in the air.

I'd also use the panda plastic with the zipper closure I provided you links to. Light leaks will really piss you off when your plants turn hermie. And light leaks is one of the best ways for them to do that. When its dark for 12 hours, it needs to be pitch dark for 12 hours.

If you are going the carbon filter route I'd probably just attach the Vortex to it, let it suck the smelly air in and blow the clean air right back in the room. Thats all that filter contraption thing is going to do you gave me a link for. It doesnt have any kind of an exhaust. I dont know what you would gain by blowing clean air filtered by the carbon scrubber into that space in the wall. And, whithout exhausting that air out of the room you would lessen the suction effect I would think, which is good.

I'd also get at least one, most likely two wall mount oscillating fans (14-16") amd mount to the side walls to save floor space. I'd want to try to keep air moving around in there as much as possible.

And I sure hope your house is AC'd, because with summer not far away, you will need it. If not you are going to have a mutnherfucker of a heat issue on your hands when it gets 90 degrees outside. For one that H.I.D. light makes heat, and the other is you are not at liberty to have ballast outside grow area, so there is more heat.

I wish you success, and I shall now bow out gracefully and let you proceed. Or maybe someone else here is growing the same as you and has some ideas. I guess I am spoiled because I had the good fortune of being able to use a spare room, and do whatever I needed to set my room up properly. This may also cause me to overlook the obvious for someone in your predictament. Maybe I wasnt the right person to be offering ideas to begin with.

Best of luck with your grow.
b0nger:thumbsup: