The Lennox 18Y77 Blower Wheel, measuring 15 inches by 15 inches, is a replacement component designed to circulate air through compatible HVAC systems. Installed within the blower assembly, it rotates to move air across the heat exchanger or evaporator coil and distribute conditioned air throughout the building. Suitable for compatible Lennox furnaces and air handlers, this blower whee... https://www.partshnc.com/18y77-lennox-15x15-blower-wheel