HVAC units, namely, Unit Heaters, Air Turnover Heaters, Blower Cabinets for Heaters, Condensing Units for cooling indoor air, Direct Fired Heaters, Electric Heaters, Energy Recovery Ventilators, Evaporative Cooling, Gas Infrared, Packaged Heating/Cooling Makeup Air units, Hydronic Unit Heaters, Duct Furnaces, Packaged Indoor/Outdoor Heat/Cool units, and Used-Oil-Fired Heaters

INFRARED HEATERS, COOLING MODULES, AND BLOWER FILTERS AND CABINETS THEREFOR

UNIT HEATERS

HEATING FURNACES [ AND STOVES ], CONSOLE HEATERS, [ FIREPLACE HEATERS, ] UNIT HEATERS, CIRCULATING HEATERS, FLUE EXHAUSTERS, AUXILIARY GAS BURNERS, [ GAS HEATING STOVES, OIL HEATING STOVES AND ] GAS CONVERSION BURNERS