Alan Manufacturing, Inc. - Round Air Duct Mufflers/Silencers

ALAN's Duct Silencer reduces noise traveling through ductwork.

Order Code: Duct Muffler-"Size"

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Unit of Measure

Items	1478 5 Inch (in) Diameter Round Air Duct Mufflers/Silencer	1479 6 Inch (in) Diameter Round Air Duct Mufflers/Silencer	1480 8 Inch (in) Diameter Round Air Duct Mufflers/Silencer	1481 10 Inch (in) Diameter Round Air Duct Mufflers/Silencer	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.