space heaters for household, industrial or commercial use

installation, maintenance and repair of commercial and residential heating, air conditioning, ventilation and water treatment systems; maintenance of mechanical and electrical systems

HAND FIRED AND STOKER FIRED/FORCED AIR RESIDENTIAL SOLID FUEL FURNACES; HAND FIRED GRAVITY AIR CIRCULATED RESIDENTIAL SOLID FUEL FURNACES; HAND AND STOKER FIRED RESIDENTIAL SOLID FUEL SPACE HEATERS; COAL AND WOOD BURNING HEATERS; SOLID FUEL CENTRAL HEATING FURNACES; AND STOKERS SOLD AS A PART OF SOLID FUEL FURNACES AND SPACE HEATERS

HAND FIRED AND STOKER FIRED FORCED AIR RESIDENTIAL SOLID FUEL FURNACES; HAND FIRED GRAVITY AIR CIRCULATED RESIDENTIAL SOLID FUEL FURNACES; HAND AND STOKER FIRED RESIDENTIAL SOLID FUEL SPACE HEATERS COAL AND WOOD BURNING HEATERS; SOLID FUEL CENTRAL HEATING FURNACES; AND STOKERS SOLD AS A PART OF SOLID FUEL FURNACES AND SPACE HEATERS