UNSPSC 31261707: HVAC sound attenuator

A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

UNSPSC 31261707 HVAC sound attenuator is a Commodity code that encompasses sound-dampening components for heating, ventilation, and air-conditioning systems procured by state and local governments. Recent opportunities show state and local buyers purchasing both general HVAC supplies and equipment and specialized overhaul and modernization services for transit fleet HVAC systems. The issuing bodies soliciting under this code include school districts and regional transit authorities; the Laredo Independent School District and Utah Transit Authority represent the activity captured in recent postings.

Activity under the code appears concentrated in Texas and Utah. The Laredo Independent School District issued RFP 26026 on September 28, 2026, seeking HVAC supplies and equipment for its Child Nutrition Program, with proposals due October 20, 2026. The Utah Transit Authority issued RFP 2604043TD on April 24, 2026, seeking contractors to overhaul and modernize HVAC units on 38 Bombardier Bilevel commuter rail vehicles (82 total units comprising Stone Air and Westcode equipment), convert refrigerants to R-407C, install microprocessor-based control systems, and deliver pilot installations, comprehensive quality documentation, Factory Acceptance Test reports, and two-year warranties through December 31, 2030. The UTA project used best-value evaluation weighted 70 percent technical and 30 percent price, with questions due May 11, 2026, at 2:00 p.m. MDT and proposals due May 25, 2026, at 2:00 p.m. MDT.