DESC: Friedrich WS14B10 Wallmaster Thru-The-Wall Air Conditioner 13,500BTU 115 V. The Wallmaster thru-the-wall series is ideal for new construction, retrofits and residential remodeling. This unit offers ultraquiet operation, dependable performance and the highest energy efficiency ratings. The contemporary style and natural color compliment any decor. Interior noise and vibrations are virtually eliminated by the extensive sound insulation. The smooth power of its rotary compressor reduces operating noise with increased efficiency. The larger blower wheel and condenser fan allow for greater movement of air at lower speeds. Standard grilles are painted, stamped, galvanized sheet metal for superior durability.