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A lot of good info concerning the Lucas Ratio on this page, https://www.greenpassion.org/index.php?/topic/30423-lucas-formula/page__hl__%2Bwhat+%2Bppm+%2Bused+%2Bwith+%2Bgeneral+%2Bhydroponics+%2Bnutes__fromsearch__1

I just finished my exhaust cab and I couldn't be happier with the outcome. It totally silences the fan noise. It contains my fan, charcoal filter and muffler. I have it set up to exhaust two cabs. Sweeeet!!!!

I've found a couple of sources in the US but have heard reports that some of it is of low quality. I would like to try it out, I saw a thread from a Canadian grower with a side by side trial with soil and the Mapito bush ended up twice as big and healthier.

If you're going to do this (which I wouldn't recommend, It's not worth your families lives) I would buy two or three carbon monoxide detectors and make sure they work. I think the fire department can check them out for you.

Yeah Michaelangelo00, I've given up on that idea. I'm thinking about venting out an existing cat door (which I'll plant some shrubs around to conceal) or I have a tool shed sitting next to the wall I'm placing the cabinet against that I can run the exhaust into. I added a stand that I'm going...

Excellent info Asmallvoice, Just what I needed. Those fans you suggested must be very efficient and for a great price too! The light reflector I was planning on using is the Hydrofarms Daystar, it has a footprint of 12" x 22". I'll get some 6" tubing to test with on fitting it all in that space...

Asmallvoice, Thanks for the response. Here is a layout of my cab, I'm planning on using a 250 watt HPS bulb with an ebb and flow system. I also be ventilating a smaller vegging cab. My intake air will be coming from the outside and I will try exhausting to the room at first. I'm open to any...

Hey all, This is my first post. Great info here. I have a 3'x 5'x 2' cabinet I'm in the process of building and I'm wanting to ventilate it through a shared clothes dryer vent. Can I use a Y-adapter and hook my exhaust from the cab and the electric clothes dryer together? I'm assuming I'll need...