Im using a 150w hps the tent is a real small lol i dont know lxh buts it about 5'5In a small space like a grow tent the exhaust friend can be vital. Depending on the size of your light it can be the first line of defense against heat. Sometimes it requires air cooling the light also. What size light are you planning to use in what size tent? Recirculating the hot air is no solution at all.
Im on top of that already! Thanks!....and control humidity! You don't want mold or mildew...get a hygro meter...get an idea of what the numbers are hitting in there, max/min
Thats the same thing i was thinkin.. but i wasnt sure!a simple passive intake/exhaust setup can go a long way to knock down temps. even if you aren't hitting particularly high temps, its still a good idea as it will bring in fresh air that the plants need.
thats im doin now wit a fan blowin in iti just leave mine unzipped most of the day to keep fresh air coming in