DURADUCT

Ducts, namely, metal ducts for ventilation installations, metal ducts for ventilation, heating, air-conditioning for fire-rated ventilation systems, metal ducts for ventilation, heating, air-conditioning for blast-resistant installations, and metal ducts for ventilation, heating, air-conditioning for ballistic-resistant installations; walls, namely, metal fire-resistant walls; enclosures, namely, metal fire-resistant enclosures composed of metal panels; Ducts made of metallic materials, namely, galvanized metals, stainless steel metals, or specialty metals, for ventilation, heating, air-conditioning

Ducts for electric cables

Ducts made of non-metallic materials, namely, non-combustible materials and fiber cement core materials, for ventilation, heating, air-conditioning; Ducts, namely, non-metal ducts for ventilation installations, non-metal ducts for ventilation, heating, air-conditioning for fire-rated ventilation systems, non-metal ducts for ventilation, heating, air-conditioning for blast-resistant installations, and non-metal ducts for ventilation, heating, air-conditioning for ballistic-resistant installations