Why is there still smell outside my apartment?

you want to be able to filter all the air in your room every 3 minutes maximum. The more you have the better you are

anzohaze said:

you want to be able to filter all the air in your room every 3 minutes maximum. The more you have the better you are

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Yeah, I already have that.

anzohaze said:

You need a room scrubber to continually scrub air. Get another carbon filter for when your exhaust. The exhaust filter should be bigger then exhaust fan. You will then virtually have no smell as you have one filter continually running in the room and the other one for exhaust

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Why should that matter when I have negative pressure and a huge carbon filter?

And what if the second one doesn't work; get a third?

When do I stop? When the room has more carbon than plants?

TheYokel said:

You are forgetting Occam's Razor... the simplest answer is often the correct one.

You have zero smell in your apartment. Zero smell on your floor. Zero smell in your attic.

But it smells outside on the first floor.

Someone on the first floor smokes with the window open...

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I like the way you think. However..

I know I am the cause because I took out the duct today and the stairwell smelled 10x as much.

Also, it smells basically ever hour of the day. Literally every time I go downstairs and exactly in the same place..

Wekl quit being a dick and use ur head you have 1 filter and fan for air scrubbing and exhaust. If you have a 800cfm filter run a 400cfm fan to make the air slowly pass thru carbon for a better scrubbing. The faster the air moves thru filter the less it filters the slower ir moves thru filter the better the air bis scrubbed. Its always smart
to have 1 filter thay scrubs
the air in room and another for extraction.

if your humidity in the room is above sixty percent your fan wont work at all... its collecting moisture and clogging the filtration... I dont even exaust my 5x6x7 room with a 170cfm fan and 200cfm capable filter

Overpowering ,,,,, urge ,,,,, for ,,,, sarcasm . . . . . . Give your plants a bath more often!

I'm with the Ozone crowd on this one.

http://growershouse.com/8-uv-in-line-duct-ozonator-high-output-uv-bulb?gclid=Cj0KEQiAp4yjBRCE_enjmpug944BEiQATCpLvV9RXt9IKitpHaqfd29PdN64pucUKy1feooUxg5D-j4aAn9X8P8HAQ

here is what i use. have this at the end of your ducting. but dont have it blowing into your living room lol. have it go into the attic or walls or something. you also need to have like 20ft or so of ducting after it so it can turn everything into o3

I think getting a tent would solve your problem.