i have a heat problem, and would appreciate some help.
here are the specs:
grow room is 4fx4fx6.6f (1,2mx1,2mx2m). running a 400W Son Agro HPS. got a fan circulating air inside. extractor is 4,7inch ducting (120mm) with 190m3/h inline duct fan.
inlet is one hole with 5,1inch ducting (130mm)...