6 Metal chimneys and metal pipes, clamps, and fittings therefor of metal; metal building products, namely, formed metal conduits, and metal air filtration screens both with and without shutters incorporated therein; metal chimneys for fuel burning appliances, namely, furnaces, fireplaces and stoves made primarily of metal; fittings of metal for pipes; flexible metal connector pipes; ventilating ducts of metal; metal chimney liners; metal chimneys and structural parts therefor, namely, baseplates, couplings, tee sections, covers, rain caps, spacers, collars, stove connectors and adapters; metal chimney caps; metal chimney cowls; metallic venting pipes and tubes of metal for appliances using various fuel sources, namely for HVAC ducts; ventilating ducts of metal; metal venting parts, namely, metal connector pipes for venting; metal pipes and metal elbows for pipes, and structural pars therefor, namely, tees, and supports; vent adapters; alignment pipes, namely, alignment pipes of metal chimneys and structural parts therefor, namely, for venting; tee-caps, namely, metal tee-caps for venting; metal chimneys and structural parts therefore, namely, metal tee-caps for venting having metal latches; metal vents for venting gas appliances; metal roof hatches, metal smoke vents for chimneys, metal chimney floor doors and sidewalk doors; chimney and pipe structural parts made of metal, namely, flashings, split angle rings, flange adapter kits, supports, and guides; metal chimney structural parts, namely, supports and buckets; metal duct connectors for use in HVAC installations; metal chimneys and structural parts therefor, namely, access doors, roof hatches, garage doors, and static heat and smoke vents, all made of metal; ventilation systems comprising metal gas vent pipes and metal chimneys; metal air duct fittings for use with air distribution systems