The roof of the heavy-duty greenhouse is made of 6mm double-walled translucent PC panel(99.99% UV protection) and transparent endurance panel (high density, not easy to break)around, balancing light exposure and preventing plant sunburn. Walk-in Greenhouse for Better Ventilation, 4.4 FT wide double swing doors (with door hooks) for easy entry to dozers and people. 2 adjustable side vents for air convection. A Victorian roof crest design is added on the top.