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  1. M

    Trying to get negative pressure in rm w/CO2

    will a 6" inline fan pull enough air from the light fixture where the glass lays into the frame to keep a small room in negative pressure? i don't see how co2 would work if your bringing in fresh air with an exhaust fan.
  2. M

    Relative Humidity Control

    The below is from Meangreen on another site. My question pertains to RH. The grow room is virtually air tight with a portable ac that sucks in air from the outside and exhaust back outside and all ductwork is insulated. Outdoor rh goes from 60% in the morning to 30% in the afternoon but my grow...
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