Hey guys! Ok so.. I built a big box out of lumber. It's roughly 5+ foot long, 3 foot deep, and almost 8 foot tall. I am going to be lining it with Orca grow film, and make it a sealed grow. I am gonna be running two 650w LED's (Side King SK7000d). I know this is gonna put out some heat so I need to air condition the box. However.. I can't fit the air conditioner.. IN.. the box. So.. I was gonna run it next to the box with a 4" duct coming from the blower part.. straight to the upper left wall of the box. Only problem is.. pressure. I am gonna be running a CO2 tank and would like to keep a steady daytime flow of 1400ppm. I am afraid that IF I have to put a couple small holes in the tent so when I use the air conditioner.. the air will actually be able to enter the box.. that I will be flooding my room with CO2. And in turn.. could possibly either harm and or kill me. Any thoughts on how I could do this?