Nov 28, 2013 #1 K kc52712 New Member How much fresh air is need in a sealed 3x3x5 grow box with optimum ppm co2 and plenty interior circulation ? Since plants produce o2 as a byproduct of photosynthesis , i am currently building a g/box from an old upright freezer.
How much fresh air is need in a sealed 3x3x5 grow box with optimum ppm co2 and plenty interior circulation ? Since plants produce o2 as a byproduct of photosynthesis , i am currently building a g/box from an old upright freezer.
