The palram essence 8 x 12 twin wall hobby greenhouse gives you 96 square feet of growing space and is loaded with features this structure boasts two vent windows for ventilation and a ramp style threshold to accommodate wheel barrows or wheelchairs additionally high clearance double doors allow for easy access the reinforced roof and virtually unbreakable polycarbonate 4mm thick panels make the essence one tough greenhouse light weight panels slide into the sturdy rust resistant frame fo