Air Handler Cabinet (36" x 20" x 23") for heat exchanger coils from 100k-140k Btu and 1/4-hp Blower & Motor. Blower & Motor and Heat Exchanger Coil are sold separately. Cabinets are standard with front water access. For back water access, order kit 3822 (sold separately). Air Handler Cabinet door is capable of holding a filter (not included). Some assembly will be required. If utilizing an existing 24-volt thermostat to control blower, a Fan Center Relay (p/n 515) must be used. NOTE: Air Filter not included (Size 16" x 20" x 1")