I had a 2x3x4 box w a 600w led in the back of my walk in closet. Biggest problem was during lights on I had to have the closet door open and the box door open. Had to be there every day at lights off to close it up. I think 95% of my heat problems was from weak ass exhaust fans. And I didn’t think it out too we’ll designing the box. I have a 2x4x5. same light. in the same closet w an actual 6” inline exhaust and I leave the tent zipped up all the time now. In the summer I just leave the closet door open and use a/c from the adjoining room to cool the closet. In the winter my closet dips down to the low 60s and keeps he box about 68-75 during lights on. I just keep my closet door open when lights are on and closed when off. Works 100%
Also I live in a house and my neighbors are lovely so I don’t worry abt smell at all. I enjoy it actually.