Kit makes SolarSheat 1500G or 1500GS (Item#s 456300, 456301, 456302) easy to install. Kit has required hardware to duct air into collector and into your home through an 11&Quot; thick wall or roof. For easy installation of SolarSheat 1500G or 1500GS (Item#s 456300, 456301, 456302 Includes gasketing, collars, wall grills, fasteners and a digital DC thermostat Roof flashing and roof mounting hardware not included