The RAB42MG GE Zoneline PTAC Wall Sleeve has a quick snap assembly made for use with the GE Zoneline PTAC models. Constructed of heavy duty galvanized steel and lined with acoustical and thermal insulation, this sleeve will bear the weight of your GE Zoneline when it is installed. The galvanized steel sleeve is shipped flat and easy to assemble for a sturdy case for your PTAC unit. An exterior weather barrier is included for construction purposes.