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Temperatures over 90° can cause stress for your plants so I would do whatever you can to get those temperatures down below 90°, that's my maximum temperature during vegetating for my grows. If you already have some ventilation, you could replace it with a more powerful fan, but typically some form of ventilation is required with grow boxes/tents as well as air circulation within the grow box/tent to keep the air moving around the plants. More information, including pictures, of your grow environment would be helpful in coming up with solutions to your problems. Check out the New Member Start Links link in my signature which contains many useful links including how to upload photos.
This is the cabinet
I use ice during the heat of the day. I have a couple of 1 gal. plastic milk jugs I freeze in my freezer then put them in the tent during the day. I also run my lights over the night hours when the heat is less.
It appears that there are no vents anywhere in this cabinet, is that true? You will need a least one intake and one exhaust vent at the very least for your grow environment if you want to grow with the cabinet closed. One vent should be located up high and the other down low on the opposite side of the cabinet to promote good air flow throughout the cabinet.
Tead, good points that I forgot about. I've used ice before with mixed results, but running lights on during the night is a good suggestion to keeping heat issues in check.
Do you know the CFM rating of those fans and are they actually pushing air out of the cabinet? If you place a lit incense or punk stick near the intake vent with the doors closed and the fans running, you should see smoke entering the intake and exiting the exhaust. You want a complete exchange of air within the cabinet every few minutes or so.
Tead, good points that I forgot about. I've used ice before with mixed results, but running lights on during the night is a good suggestion to keeping heat issues in check.
Can you elaborate on your mixed results using ice? did it not work? did it harm the plants?