I'm in the process of setting up my grow room and recently purchased a controller that handles CO2. Yay me. I'm also at a point where I'm ready to cut the holes for my passive air intake and had some questions related to safety as I understand that when CO2 levels reach 5000 ppm they can be deadly to humans.

Some background:
My grow room is basically a full-size closet situated in a room of my house. Because of this setup I'm using the air within this common room to provide fresh air to the garden as air from outside the house would be hard to get. I have two vent systems set up. One closed circuit for the light (room air > 265 CFM squirrel cage fan > light > exhaust through roof), then another to vent the grow room ( passive intake > grow room air > 465 CFM squirrel cage fan > exhaust through roof). Sound good?

The meat of the matter:
As I have read, passive air intakes should be positioned towards the bottom of the garden opposite of the exhaust fan. I have an idea of where this is going to be, but I also understand that CO2 is heavier that air and sinks to the floor. I will have fans within the room to mix the CO2 up but, do I need to worry that the CO2 will seep out from my passive air intake between ventilation cycles? causing a build up of CO2 in the common area in my house? While visiting Casa De-Pot I saw a ducting contraption that closes when air is not moving through it, kind of like a coupler with a flap inside it. Would this be sufficient to keep CO2 from escaping? One concern that I have about this device is that it could hinder the CFM output of the 465CFM fan. Is there a better solution for this?


Your input is greatly appreciated as I'd hate to end up dead.

-dodo
dodo5678 Reviewed by dodo5678 on . CO2 Safety and setup I'm in the process of setting up my grow room and recently purchased a controller that handles CO2. Yay me. I'm also at a point where I'm ready to cut the holes for my passive air intake and had some questions related to safety as I understand that when CO2 levels reach 5000 ppm they can be deadly to humans. Some background: My grow room is basically a full-size closet situated in a room of my house. Because of this setup I'm using the air within this common room to provide fresh air to the Rating: 5