While many acoustic materials “look” right for the job, there are considerations that need to be taken when specifying materials for lining a duct, because there is a wide variety of products that can be used for acoustical duct liners.

Reducing noise carried through ductwork is a vital function to help create a more productive work, living and learning environments. Effective noise reduction in ducts calls for an integrated strategy of good mechanical layout, vibration isolation and insulation with noise absorbing properties.

In addition, duct liners for commercial construction use have to meet certain code requirements when installed. Below you can find a list of the technical data that duct liners are required to meet according to the North American Insulation Manufacturers Association.

Fire Resistance

• Meets NFPA 90A and NFPA 90B Standards for fire safety.

Temperature Range (ASTM C 411)

• Up to 250°F (121°C).

Air Velocity (ASTM C 1071)

• Maximum 6000 fpm (30.5 m/s)
• Service temperature not exceeding 250°F or lower than 40°F

Corrosiveness (ASTM C 665)

• Does not accelerate corrosion on steel, copper or aluminum. 

Corrosion (ASTM C 1617)

• The corrosion rate in mils/yr will not exceed that of the 5 ppm chloride solution.

Water Vapor Sorption (ASTM C 1104)

• Less than 3% by weight.

Fungi Resistance (ASTM C1338)

• Does not breed or promote

Bacteria resistance (ASTN G22)

• No growth

Duct coatings remain the most economical way to control noise and temperature in a duct system; however, it is important to do research before making a purchase, to make sure the coatings are meeting certain specifications. The standards above were created so that the operation of fibrous glass duct lined systems are more dependable and provide desired acoustical, thermal and indoor air comfort performance for the system’s design service life.

Are you in need of acoustical duct liner? Sound Acoustical Solutions offers an array of products that are proven performers in the acoustical world. Learn more here!