This insulated case is constructed of heavy gauge galvanized steel which is finished with a baked-enamel finish for protection and appearance, and is insulated with expanded polystyrene foam. Design of the case provides for support of the chassis and free draining of any water entering the wall case.

A petroleum microcrystalline wax is applied at critical points of fabrication to seal against moisture. The dimensions of the RAB81B wall case are 42" wide by 16" high by 13-3/4" deep, the same dimensions as the original wall case for GE Zoneline® units built in 1961. This case is color matched for AZ45 / AZ65 series air conditioners and heat pumps.