I knew I wouldn't be able to spend a lot of money on odor control, even though I really need it. So I put this together at work and wanted to get some opinions. I think it will work but have a few questions.

It's made of 1/8" thick steel fully welded from the inside. I also leak tested it, not because I thought an air leak would hurt anything but to make sure my seldom used welding skills are still there. It is 12-1/2" x 12" x 20". With (2) 5" inlets and (1) 6" outlet. The out may need to get bigger but right know I have a 6" fan so thats what it is. There are 2 ins because I plan on having (2) 600w lights in the future with some DIY air cooled hoods. I bought the filters you see in the pic, I got 2 and plan on cutting them in half so there are 4 layers of filter. The side is removable for access to change the filters, I have rubber seals to put around the edge to help with leaks. You can see the hooks to hang it from my ceiling. I plan on finishing it tomorrow and painting it.

Know for my questions...

1. Do you think it will work?

2. Is that to much filter?

3. How should I space them? I thought it would help air flow to have them 3" apart instead of all together like 1 thick filter.

If you have any comments or suggestions I would love to hear them.

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Light cooling isn't supposed to run through filters, it should be isolated from plant air..

Thanks for the input. I do plan on this air exhausting from the room. I do realize cooling the lights with it will probably get the filters to hot. I don't really need to vent the lights any way and this sucking air out should provide with enough cooling. I'm waiting for the glue to dry on the seal and I'm done with the filter but still need to finish hooking up the fan and tubes.

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Here are the finished pics. Tomorrow after the glue is good and dry I will be hanging it and setting up the fan.

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I finished and hung up the filter. It works pretty good. You can only smell it every once in awhile. I need a stronger fan to make it work properly. I thought 280 cfm would do more. Oh well, it will probably turn into my intake. I have 1 hose sucking in the grow area, and plugged off the other side. Here are some pics.

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You don't want active intake, you want suitable exhaust and passive intake.. This will help prevent odour leaks because of the negative pressure created in the space..

Thanks agian. I will remember that. I guess that is why I was think a stronger fan, to get the negative pressure.

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And sometimes you do need active intake, but not in many cases.. Only when the pressure gets too low and air exchange rates need to be higher.. But you will still want that negative pressure otherwise you'll get smelly air sneaking out via other routes without being filtered.. Even if the box is otherwise air-tight, odour can sneak back out the intake when positively pressurized..

Since you seem to have readily available metal working "stuff," why not make custom filters that you can fill/refill with activated carbon?

Perhaps two layers of steel mesh (small enough grid to hold the carbon) with either a metal or wood frame.

Know what I mean?

Anyway... carbon will scrub out smells much better than those filters you have.

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DIY 3 gallon DWC bubbler tutorial - Diggitydank's 2nd DWC grow

Thanks for the suggestion. I did look at different ideas as I put this together. For the 2 filters I paid $20. I couldn't find active carbon cheap enough for my liking. The filters do have active carbon in them, and there is no smell coming out the exhaust.

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Use the truth as a weapon.
Beat your friends with it.