The foam duct liner demonstrated good performance in sound absorption per ASTM C423 at frequencies below 1000 Hz. However, that does not appear in the insertion loss data. For frequencies below 250 Hz ...

The vast majority of installations specifying flexible closed-cell elastomeric duct liner have been for traditional rectangular ... insulation is that it provides both adequate levels of sound ...

Learn More › Mold in your air ducts isn’t just gross—it can make your home smell musty, cause respiratory problems, and ...

Duct smoke detector maintenance requirements are not included in the NFPA standard that covers HVAC systems (NFPA 90A or 90B); however, the International Code Council’s 2015 Mechanical Code does ...