so ive been wanting to put a 400w in my closet, but i have no way to exhaust it out of the closet while keeping the door closed, anyone ever cut a hole in the wall and blowing the warm air into the space created by the studs between the drywall?

Do you have the option of doing the same thing but into the attic?

na its some weirth plastery ceiling, cant cut into it

Do you have any pictures of the area you are speaking of?

NO, you can not blow that hot humid air into the walls of the house unless you want moldy rotting walls. That wierd plastery shit is more than likely Lath and Plaster. It is a little messy, not anymore powder around than you get with drywall. A drill and saber saw would do it. VV

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yeah, i have the same setup with a 250hps, wish i had the 400. what i did was put an intake pc shooting air at the level of the plants. it pulls air in from a hole cut into the area between the stud in the drywall. along the same stud space i drilled a hole on the other side of the wall (MY BEDROOM) and fit a wall vent over so it is not suspicious at all. that is my intake if it makes sense.

outtake i rewired my bathroom fan to a new one that i put in the top of the closet. it pulls air through a carbon filter and exhaust through a hole i cut into the ceiling. with the way i wired it is hooked up to the switch that controls my bathroom fan.
i love this system. before i used to just have a closet in another room and just kept the door open with a fan on. now, i have the closet shut with even a blanket over it to hide the door. temps are not a problem at all and i also get constant air exchange

It won't work. At most, you'll have 16 inches of space between the vertical studs which run the height of your floor to ceiling. It'll basically be like blowing into a enclosed box. If you have an attic directly above you, it shouldn't be anything more then drywall and a layer of joint compound(textured). Granted, you'll have ceiling joists and most likely insulation as well. Easiest way is just to get up in the attic and check. You might also be able to knock on the ceiling to locate the joists or use a stud sensor to figure out where to cut between.

The above says it all.

Will it work,yes it will.

Will it cause you major problems,yes it will.

Introducing things that WILL cause mold in your home is on the top ten list of things to never do,there are serious unseen health risks including death with mold.

I lost a very dear friend over black mold a few years back,we bought a small defunct factory as partners,the building hadnt been occupied in a few years & was filthy,i wanted to contract out the cleaning & he wanted to save money & do it his self,while cleaning a moldy ass wash basin he came in contact with mold,one spore lodged in his lung & he was dead in 3 days,dont fuk around do it right.

Exhaust air needs to travel through galvanized or fiberglass ducts & be vented directly to the outside,never into a confined space.

i want toi clarify...like everyone else is saying, you cant just jam the air into that closed space. with my system, the space is utilized, but also not enclosed as i have an opening on the opposite side of the wall in effect making a wind tunnel out of the stud space

I have a great setup in closet with no ventilation, i am pulling cool air in from the wall, running through my box, and then let it vent into the rest of the closet. I have 2 ionizers running staggered on timers, one in closet and other in bedroom. I have 3 girls in full bloom and can hardly smell a wisp.