A sealed grow room, eh? Interesting but I need to keep it simple. I'm taking on quite a bit as it is and feel that dealing with that many issues would be overwhelming.

I've settled on my strategy for venting and odor control - a good 6" carbon scrubber vented to an adjacent room with an ozonator in the vent room. I can also place one elsewhere in the house if needed. My intake will have to be passive with some fresh air coming from a window located elsewhere in the basement. I am going to eliminate the external vent all together. Making it work would be too destructive/disruptive with the other utilities that are currently utilizing the space - whole house vacuum exhaust, 2x electrical out, and gas line for the grill. Upgrading the vent to 4" could be accomplished with considerable work but risks to the vacuum. Scrubbing and venting interior to the house makes the most sense. If I face odor issues then I'll take the steps needed to vent externally at that time.

Following the advice of someone here I have settled on my grow room particulars / strategies. Now I'm gathering the materials. I'm still not ready to build so I'm just planning, reading, learning. I'm going to do a scrog setup. I've increased my room size so that I can work comfortably around the scrog. The scrog will be 32" x 54" and I will be looking to put 4 plants under the screen. My room size will be 6'W x 5'L x 6'6"H. I'd like to have the option of expanding the size of the scrog in the future hence the room size. The room will be wood frame construction with drywall, although I am considering other wall board construction due to humidity issues. Thoughts welcome. I will create a mylar box to enclose my scrog.

Thanks for all the help with my venting setup. Any thoughts on the strategy outline appreciated. Recs on carbon scrubbers too!