Sound attenuators are designed to quiet fan and air-conditioning devices noises in ventilating ducts, and to prevent propagation of noise between rooms.

CSA-1 Circular sound attenuator in galvanized steel	CSA-2 Circular sound attenuator in galvanized steel	RSA Rectangular sound attenuator in galvanized steel
AB Acoustic baffles for rectangular sound attenuators	AL Acoustic louver in galvanized steel