exhaust, cooling and filtering a closet

im working on my exhaust system for a closet build and i have 3 fans. i have a 178 inline can fan with a matching can filter, a 265 active air squirrel cage fan (noisy), and a little 6 inch inline duct fan. i need to use these fans to cool 2 400 watt Cool Tubes. and exhaust and clean a closet just about 40 sq Ft.

i have a few options, i was going to setup my exhaust with the can fan and filter straight to the attic, then set up the two Cool Tubes connected together with the 6 inch duct fan in between and an independent intake so the smell dose not get out, ill use the squirrel cage to exhaust the attic as well.

i want to start by hanging the can filter and connecting the can fan to it, then i going to split the air flow into two, use one as a cooling/airflow vent by running a duct so it blows air across the plants. and the other connected to the opposite side of the squirrel cage fan, that way no smell will escape through the exhaust plus im thinking it will help the squirrel cage fan on the other side, im still gonna exhaust into the attic, this will save me from running two ducts through the ceiling and also give my can fan multiple uses. i think its the best way. and i was just going to use the small 6 inch duct fan as an intake.

im asking of my new plan has any flaws. do any experienced growers know if im making some sort of air flow mistake. of if it wont work for some reason im not aware of

Take the 265 cfm fan and intake from out side the room and run it thru both lights and back out the room that way you are using no air from the room. You can use the scrubber inside the room for odor control

a diagram would help.

without pics not sure of your design, but...it sounds like you are combining the airflow from the light and the room in order to exhaust them together??? you're likely to be drawing a vaccum on your room cooling line instead of blowing as it seems you have a fan pulling air at the end of the exhaust.

splitting the air is tough to make the airflow balance - you'll want a damper on the line with the least resistance so you can balance to backpressure of both lines.

here is a diagram of my origional idea

a pic is worth a thousand words. design looks good, a couple of comments but i suspect you already know:

1. i'm assuming the two venting ducts are completely separate and only cross on the diagram.

2. you can do a passive intake without a fan if you put a damper on the hole to control airflow. if you can, place the intake low on the wall

3. place your exhaust as high up on the wall as you can,

i dont think exhausting your grow into the attic is a good idea. Actually its never a good idea to intentionally add moisture to an enclosed space like an attic, even if its properly vented. Creating warm and damp areas protected from the outside weather is practically an invition to mold, mildew, dryrot, and insects (TERMITES)

Ive seen many houses suffer severe damage from bathroom and kitchen fans vented in to the attic space. After a few years you end up with saturated insulation, sagging roof gables, and structural damage. Venting a growroom into an attic would be even worse and the ill effects would start even faster.

be careful with dampness in the attic. it should be avoided at all costs.

can you just use one exhaust fan with a scrubber and one for intake???

what do you think about re-routing the scrubbed air from the can fan so that it blows air into the intake side of the cool tubes. and another duct that will circulate air in the grow area.

that sounds like itwill work as long as your fan iss good

I have decided not to go with the my original plan

and i think im making this sound too complicated, But I basically just want to put my scrubber and fan on one end of the lights and an exhaust fan on the other, keeping it all inline. should i use my inline can fan at the end pulling air through the lights and exhausting into the attic, with the squirrel cage at the other side sucking through the filter and pushing through the lights?

i have drawn diagrams for everyone, the first one is labled, the first one has the can fan first and the squirrel cage last, and the second one shows the squirrel cage fan first and the can fan last. what do you guys think will be the best setup, because the squirrel cage has the cfm's but not the torque or power to really move alot of air, but the can fan is very powerfull. so im not sure what is the best setup

the 2nd pic looks like a plan to go with

The original design is the proper way. If you do it in this manner your expencive Scrubber will need to be replaced sooner and the needed high airflow through your lights will be compromised by the filter.

I agree that venting your entire room to the attic of "Your Home" is bad but even if this is the case there is no reason not to put the clean air going through your lights there.

i setup my 6" vortex fan outside the closet from my Air con. room pulling that cool air to lite -to attic-attached behind the bak of a 18"power fan that is laying on top of the ceilin, blowing into attic. provides cooling for the lites and pulls fresh air into the room at the same time. i'm using 1-600 wt hps.keeping lites 10" from canapy .raise a win dow some , and pulls fresh air into room, exhaust in the attic ,where the outside vent is located , where alll this air goes.Hope this mite hep some .

raiderman said:

i setup my 6" vortex fan outside the closet from my Air con. room pulling that cool air to lite -to attic-attached behind the bak of a 18"power fan that is laying on top of the ceilin, blowing into attic. provides cooling for the lites and pulls fresh air into the room at the same time. i'm using 1-600 wt hps.keeping lites 10" from canapy .raise a win dow some , and pulls fresh air into room, exhaust in the attic ,where the outside vent is located , where alll this air goes.Hope this mite hep some .

Click to expand...

i like your method of getting the air outside. but i have a vent from a bathroom right next to the closet that i can connect it to so i will basically be pumping air directly out the roof. i have a verry small attic with rotating vents and insulation i should be good with a little extra moisture

just do the best you can with wat you got it will work, anyone that is determined can find a way. i tried to keep cost minimal. its easy to spend an extra grand on somethin you can invent yourself with little cost.
i just cleared out my garage yester. garage doors broke , so i cut out a measuered hole in it and mounted an air conditioner.set up another 660and i am going to vent it the same way, because my buds get pretty decent . gonna keep the closet deal goin, only thing its in my bedroom .its lit up like las vegas in there.keeps a sweet skunky smell
around i love though,lol

if noise is a problem, I would avoid using the noisy squirrel cage fan. I would stick with your first drawing. use the smaller can fan for the 2 lamps, with a sealed loop, fresh air from outside, cool the lamps, then exhaust right back out with no odor. the other can fan I'd use for the carbon filter and exhaust, then have a passive fresh air inlet. a passive inlet should be 2 or 3 times bigger then the active exhaust, and have a screen to keep bugs out.

when using exhaust fans cant you just keep one on the whole time the light ison instead of having it connected to a thermostat?

here it is, all done. and the reason ive been absent lately

how are the temps with your setup like that???

yeah i about to buy an inline fan and i want a good one. i have a 4x4x6.5 tent. so far all i got is a duc t reducer fan. i cant decide if i want to seal the cooltube path on its own circuit with just a duct reducer and then use the inline fan to pull thru a chracoal filter and exhaust the tent, using a passive intake. or i want to do what yu are doing. i need the way that gives better temp control, heat is my biggest enemy and air condiotner a big pain right nowl