Garbage Can Grow (heat issues)

i garbage can grow myself, kind of, was inspired by gc grow setups
i made the can out of sheet metal so to get the exact dimensions i wanted
anyway, if i understand you correctly, you don't have an exit vent?
exhaust out the hot air at the top, otherwise you will hit the wall soon with the heat/lighting you will need to flower

I'm going to be transferring all 5 plants outdoors for the summer and they will flower out there.I guess you could call my garbage can a seedling machine...