Duct mounted silencer(Sound Attenuator,air grille)

Sound attenuator The scope of application:The muffler shutters are especially suitable to eliminate noise for exhaust machinery room in rooftop.Significant effect to the regional environmental noise reducing as well. Structural characteristics:The muffler shutters use blades made from Galvanizing-bending perforated plate for noise reduction.Outward-facing slope and front side is no perforation to protect sound-absorbing film against the rain destruction.Sound-absorbing films use materials of mineral wool and glass cloth.Every 10-15dB(A) lost resistance 29.2-29.4Pa,applicable flow is 1500m3/h-3000m3/h per square meter. This muffler shutter is a multi-purpose shutter,it block the noise while make the room.