This is my green house Im attempting to make, its not quite finished yet but its getting there. the dimensions are 12Ft x 5Ft and 8Ft tall at the peek of the roof Im building it out of metal 2×4 studs cut to length and then welded together with a cement base. For cooling and ventilation Im using two high velocity thermostat controlled attic fans, one blowing in from the back end and one blowing out from the front end. If you don’t recognize the 2×4 metal studs im using that’s because you cant by these, I had access to a machine that isn’t out on the market yet and was able to make them custom.
21 weeks of growing