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My grow box spec's size 40x24x53 inchs light 250w htg hps/mh set up exhaust fan 8" inline 240 to 500 cfm set on 240cfm attic space thermostat set on 78 f small fan inside circulating air exhaust fan and attic thermostat keep box at 78f fan turns on for five min every 1/2 hour or...