SECTION 233113 – DUCTS AND DUCT ACCESSORIES

Single-wall rectangular ducts and fittings. Single-wall round < and flat-oval > ducts and fittings. Double-wall round < and flat-oval > ducts and fittings. Duct liner. Hangers and supports. Seismic-restraint devices. Backdraft dampers. Manual volume dampers. Fire dampers. Ceiling radiation dampers. Smoke dampers. Combination fire and smoke dampers. ................
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