Alan Manufacturing, Inc
3927 East Lincoln Way
Wooster, Ohio US

Phone: (800) 435-2526 or (330) 262-8077
Fax: (877) 333-2526 or (330) 262-1556
Email: alansteel@alanmfg.com
Website: www.alanmfg.com
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ALAN's Duct Silencer reduces noise traveling through ductwork.

Order Code: Duct Muffler-"Size"
Round Air Duct Mufflers/Silencers
Unit of Measure
Items Round Air Duct Mufflers/Silencers
1478
5 Inch (in) Diameter Round Air Duct Mufflers/Silencer 		Round Air Duct Mufflers/Silencers
1479
6 Inch (in) Diameter Round Air Duct Mufflers/Silencer 		Round Air Duct Mufflers/Silencers
1480
8 Inch (in) Diameter Round Air Duct Mufflers/Silencer 		Round Air Duct Mufflers/Silencers
1481
10 Inch (in) Diameter Round Air Duct Mufflers/Silencer 		Round Air Duct Mufflers/Silencers
1482
12 Inch (in) Diameter Round Air Duct Mufflers/Silencer
Diameter N/A 5 in N/A 6 in N/A 8 in N/A 10 in N/A 12 in
Sound Reduction at 250 Hertz (Hz) N/A 11.9 N/A 10.2 N/A 9.4 N/A 11.2 N/A 8.8
Sound Reduction at 500 Hertz (Hz) N/A 21.2 N/A 18.0 N/A 17.1 N/A 18.8 N/A 16.5
Sound Reduction at 1000 Hertz (Hz) N/A 27.5 N/A 23.1 N/A 21.5 N/A 25.5 N/A 21.8
Unit Weight N/A 5.75 lb N/A 6.25 lb N/A 7.75 lb N/A 13.0 lb N/A 15.0 lb
Length N/A 24 in N/A 24 in N/A 24 in N/A 36 in N/A 36 in
Shape N/A Round
Industry Standards N/A National Fire Protection Association (NFPA) 90A National Fire Protection Association (NFPA) 90B Underwriters Laboratories (UL)
Features N/A
  • Available in 5", 6", 8", 10" and 12" diameters
  • No airflow restriction
  • Maintenance free
  • Easy to install
  • Building Code Compliant, Meets NFPA Standards 90A and 90B
  • UL Listed, Class I Air Duct
  • Install in New or Existing ductwork
Note N/A Measurements under standard laboratory conditions at 180 cm from orifice in dBA.