Have a little 4x4 grow cabinet in the corner of my room. I live in a trailer so the inner walls are probably 5 inches thick at best with only Sheetrock and studs, no plywood. There is a exhaust vent in the bathroom about 10 feet from the box and the only thing I can think to do is to run duct straight up from the box, through the ceiling and tie into the existing duct from the bathroom exhaust fan. The only thing is, there is not much of attic in trailer homes. Any tips or recommendations would be appreciated. Thanks!
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Any way to enhance cold are intake too?
Ive done a bit of remodeling and repair work on mobile homes and youāre right - sometimes there is no attic āspaceā at all. That can make it impossible to run ducting across the ceiling joists.
You can just go straight out the side wall of the trailer if the tent is on an exterior wall, or you can go straight up through th roof. You will of course need to be able to install the proper vent cover and seal it against the weather.
You can also pull fresh, cool air from under the trailer or a near by window in the room. You will want bug screens on the intake/outflow vents.
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@Fresherbsā¦ If possible tie a fresh air intake directly into one of the central air vents in the floor. Not only is that air coming from down low. But its already filtered once or twice before it gets there. And you can control grow room temps with thermostat on wall. Run the out vent duct to fart fan in cealing. If its good fart fan, it is strong enough to move air for that small tent. And there may not be an attic so to speak. But that fart fan has a four inch duct hose like a dryer vent coming off it that goes somewhere. If only blowing wild up there in the non attic. If odor control is an issue. Then put your filter up high in grow tent, with vent hose coming off it into fart fan. An inline booster duct fan is only maybe eight or ten bucks on amazon if fart fan aint pulling hard enough. And of course keep a small oscilating fan blowing your canopy around and you should be in the game brother.
And lastly, but likely least helpful, does the trailer have AC?
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Thanks for the replies. Yeah man I have AC and the tent is located in a corner against the inner wall. I think the best route to go would be to have a fan at bottom of cabinet pulling air from below the trailer and a fan at the top pulling air to the top of house where I would install an angled cap. I guess I kind of wanted to tie on to the existing cap for stealth purposes. So I guess 2 fans for intake and exhaust, roof cap, sealant and some duct tubing is on my shopping list. Plenty of carpentry experience and Iāve done duct work before but only as a helper so I donāt think I know the exact terms for the parts i need. Any recommendations or a proper list of the little things I need for this job, on a butthole tight budget, would be appreciated. Thanks!..by the way, itās a cabinet, not a tent.
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And Iām really thinking about that idea to tie into the floor vent but Iām worried about smell backdrafting
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A single larger fan pulling air from the tent would likely do the job and be cheaper and run quieter if you get a decent one. The air inlet from under the house doesnt need to be powered. Just use a large vent hose = 6" inlet hose or so if your fan has a 4" outlet, or 8" inlet if your fan has a 6" outlet.
Do NOT vent the exhaust air directly into the āattic spaceā.or inside a wall or under the floor. It MUST go to open air outside the building.
That exhaust air is going to be humid and it ABSOLUTELY WILL cause mold to grow in your attic/wall/floor space.
You will get nasty, unhealthy mold that will also damage the joists, rafters, drywall, etc in a surprisingly short amount of time. I have repaired many homes where crappy contractors or lazy home owners didnt want to go to the trouble of going all the way through the roof/wall, etc. Huge $$$$$ and unhealthy mistake.
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Yeah haha Iām not just gonna cut a hole in ceiling, put a tube, then seal it up. What do you think about a tube running from floor vent?
I dont see the advantage to pulling air from a floor vent, Its the same air thats in the room already. It would be a lot easier to just open an inlet vent in the tent near the floor. You will get the same exact air for a lot less work 
Pulling air from under the house on the other hand would be a good idea if you didnt have AC. The air under the house will be cooler in summer. You have AC, so no need to go to that trouble.
I run two separate fan systems in my grow tent.
The first one pulls air from outside via a nearby window. The duct is just stuck in the bottom of the window so it sucks air from outside. That air is pulled through the tent and blown into the room through a DIY carbon filter. I have an STC1000 temp controller that turns that fan on/off depending on the tent temp. If it gets too hot, the fan turns on. When the temps drop, the fan goes off. Basically the fan is on almost full time when lights are on, and its off most of the lights out period - unless its hot - I have no AC. So this fan is for temp control, fresh air, and smell reduction - all automatically controlled from a $15 controller.
That same controller also turns on a small heater when needed durring lights OFF if the tems drop below my settings.
The second fan recirculates air within the tent. It pulls air out of the top of the tent and runs it through another DIY carbon filter, then blows it back in the at the bottom of the tent under the canopy. This fan runs 24/7. It is also for smell control and also circulates air below and through the canopy and mixes the air in the entire tent.
Im just using two cheapo bath fans from HomeDepot. They are a little noisy when both are running. If I wasnt so cheap, it could have been a lot quieter
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Iāve battled with this problem myself, I do not want to modify the structure of my house incase I ever choose to sell although putting one exhaust vent properly installed for the side of the house might be in the works. As for bringing an intake from below the home, it is doable but not necessarily advisable if you have a newer modular home as they are professionally sealed up from the factory and I feel cutting that original seal compromises the Integrity of it. I know tuct tape is strong but still not as strong. I also live a fridged climate come winter so that may not be a factor for you as well.
look at sewage line.
You lost me thereā¦sewage line?
look into venting air going to sewage system.
hmmmm thats interesting, care to explain more?
I sorry, but Im not a big fan of that idea 
Aside from the difficulty of crawling under the house, breaking the sewer pipe to install a T (it may be cast iron or clay pipe instead of plastic), there is the matter of āodur de shiteā to deal with
You would need to go to some trouble to be sure the smells didnt back feed into the tent and your house. The little flapper things on most fans wont cut it. Every time you flush the toilet, it causes a momentary air pressure build up in the pipes. If you had a power failure, the fan would no longer be forcing air down and it would immediately come back up your ducting.
Depending on the type of sewer system, you can also get occasional bouts of lots of excess gasses being generated which could also potentially over power your fans.
Some people think nasty smelling weed is good, but Im not a fan of sewer smell at all 
Also, technically it would be a violation of all the building codes I know of.
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could you run the exhaust duct to a window and vent out that? you could get one of those portable AC window vents to use so it doesnāt look suspicious, or false plywood window w/ drapes (2nd hole optional for intake). i just use passive intake and it works fine w/ my carbon filter right beside my lamp constantly removing heat.
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Lol ahahahahaā¦i found this high as shitā¦im looking for stealth odor control not the smell of a holding cell lolā¦oh shitā¦literallyā¦im doneā¦pm please i need help with stealthā¦ima call bg&e when I rupture a crack blocks sewer lineā¦I can see the news and my trial right now lolā¦After they discover shitty plantsā¦ooohhh loord! Yessss! HAHAHA Iām gone! 
Could punch a hole in the side of the trailer and put a dryer vent inā¦not sure if its legal to grow where you are.