Still need help with this? Sorry, I haven't been on in awhile. Found myself doing more arguing than helping or getting helped, so I took a break. Let me know man.
So I saw on a thread that you HVAC knowledge I was hoping you could tell me if it would be safe for me to tap into my furnace exhaust using a 45 deg wye and placing a backdraft damper where the duct exits the flower room. I have a thread going with a pic of the furnace area, if u want just do a search for "venting out furnace"