Ducts, not of metal, for air-conditioning installations; Ducts, not of metal, for refrigeration installations; Ducts not of metal for enclosing heating and air conditioning piping, namely, line sets; Plastic accessories for non-metal ducting for air conditioning installations, namely, brackets, supports, hangers, end caps, couplers, mounting clips, reducers, flanges, plates and sleeves

an electronic telephone line switch having one telephone line connection and multiple secured terminals connecting to telephones, fax machines or modems

MAINTENANCE AND REPAIR OF RESIDENTIAL TELEPHONE AND TELECOMMUNICATION SYSTEMS WIRING

telecommunications hardware; namely, voltage surge protectors