Silencers are devices reducing sound transmission in a duct, a pipe or an opening, without preventing the transport of a fluid. They therefore constitute basic components within the panoply of means to fight against noise both in industry, in the context of the preservation of the environment or in the building.
Those equipments allowing to control noise emissions in a gaseous medium, are appropriate (inter alia):
- for attenuation of the noise emissions by systems and for prevention of parasitic coupling produced by heating, ventilation and air conditioning equipments (they are thus useful in the context of noise reduction of equipments in residential buildings, hotels, hospitals, whether being equipment installed in an equipment room or bieng equipment installed outdoor such as heat pumps, air conditioners, air coolers ...)
- for the prevention or reduction of noise transmission through ventilation openings, from rooms with high internal noise levels (they are thus employed to prevent or limit the sound nuisance in relation to the ventilation of technical premises, of parkings, of power generation units whether cogeneration plants, emergency gensets or power plants and also in industry with respect to various processes, such as dust control facilities, chips evcuation facilties)
- attenuation of air intake noise and of exhaust noise emitted by internal combustion engines (the air intake noise is usually treated with dissipative silencers while the exhaust noise uses reactive mufflers)
- attenuation of air intake noise and of exhaust noise emitted by compressors and turbines equipped with fans
- attenuation of industrial process control valves