Air conditioning apparatus; Air valves for steam heating installations; Central heating radiators; Coal stoves; Electric fireplaces; Electric stoves; Fireplace hearths; Fireplace inserts in the nature of heat exchangers, solid fuel burners, stoves; Fireplace inserts, namely, heat exchangers; Fireplace louvers, blowers, and dampers, and ash pans for fireplaces; Fireplaces, domestic; Furnace ash boxes; Gas burners; Gas stoves; Heating installations; Heating and cooling panels used for indoor he...