Suburban makes the door of galvanized steel finished in a tough, high-solids baked enamel, making it especially chip and corrosion resistant. The standard door frame is installed without bending flanges or installing corner gussets, so installation is easier and the seal is better than competing units. The flush mount door is pulled tight against the sidewall without using screws that penetrate the exterior, giving it a neater appearance and reducing the possibility of leaks.