Fog - Here's a pic of the space I'll be using and one of the door opener and hardware. I could get it out of the way. I'd just have to be really motivated to do so, and saving a few bucks on electricity just wouldn't do it for me. I have back issues and working overhead is very painful, so ...

I'm going to take all my intake air from the garage. The ehaust from the light coolers I'll just exhaust through the garage wall. The room exhaust I have to decide about. If it's cooled air I'm exhausting, I'd want to filter for odor and exhaust it into the garage to cool the environment surrounding the grow room.

Guess I need to read up on CO2 and make some decisions.