Galvanized Taper Incinerator | Incinerators | | Garden Wellies from Wilkinson Plus do you think that will work? insert light from top and a small fan inside and it will work as an exhaust as their are holes on the bin so they will be blown out? so it should be fine?
That metal will absorb heat and make it more difficult to keep temps down I'm pretty sure. If you have power tools, go buy some plywood and make a box to to your specifications. Your exhaust holes have to be up high(heat rises). Lower holes are for intake. That way you suck in cool air from the bottom up through your plants and blow it out the top as warm air. In a box, negative air pressure is the way to go. Think of your box as your pc case. Your plants are your cpu, gpu, mobo, RAM, etc. You want more air leaving the box than is coming in. This will keep the temps down and your plants happy.
I will make more holes up high then and insert two cpu fans aswell i have nothing else atm and i think this is fine, keeping temperature down umm cant i lace the inside with mylar so instead of it absorbing it is reflected back/