NIGP 28577: Square Duct and Fittings

NIGP 28577 Square Duct And Fittings, an Item code, encompasses HVAC ductwork components and related materials that state and local governments procure for facility maintenance, system upgrades, and construction projects. Based on recent solicitations, the code captures square metal duct sections, fittings, connectors, dampers, and associated hardware used in heating, ventilation, and air-conditioning system installation and renovation work across public buildings. State and local issuing bodies pursuing this code include school districts, county departments, and municipal transit authorities; Northside Independent School District in San Antonio and Montgomery County Department of Public Safety represent recent buyers in the education and public-safety sectors.

Montgomery County's February 2026 IFB for HVAC duct cleaning services at the Public Safety Training Campus (due March 25, 2026) and Northside Independent School District's June 2026 IFB for electrical equipment, parts, and supplies (due July 1, 2026) both reference ductwork maintenance and system components as part of broader facility infrastructure contracts. Geographic activity spans Texas, Maryland, and Washington state based on recent postings. Procurement activity under this code tends to be episodic, tied to facility renovation cycles, HVAC system replacements, and indoor air quality initiatives rather than continuous demand; the Montgomery County solicitation, for example, emphasized compliance with NADCA standards and system restoration following 2023–2025 rooftop unit updates. School districts and county facilities management offices represent the primary buyers, with responses typically due 30–60 days from posting.