New room is going to be 8x12x8 with 2 1000w hps on a light rail. Just picked up a Sentinel VCG-6 LP Burner and a Sentinel CHHC-1 Controller.
My question is how often should I ventilate? I am way up North here with temps below freezing for most of the year and will be using outside air for heat control and I have a dehumidifier.
So when should I cycle my ventilation to clean out the room and start filling it back up with CO2?