Exhaust Gas Silencers use relative and absorptive principles, or a combination of both. We provide a wide range of silencers from basic industrial absorptive silencers such as the HSLS range, to the super critical HPRA 2 and 3 range, capable of handling even greater environmental demands.
It can be used singularly as a standalone product in applications such as irrigation pumps, small power packs and similar installations where the minimum amount of noise reduction is required and the final noise level is not considered to be a problem to local surroundings.
Due to the effect on the higher frequencies the design is mainly used as a secondary, or terminal, silencer for the low frequency biased expansion/reflective primary silencer types.
HP, HPA, HPRA and HPAA. The HSLS silencer can be close coupled or remotely mounted in the exhaust gas line to reduce exhaust gas noise to much lower acoustic levels.
Approximate Typical Insertion Loss Figures for HSLS and HSLS-SE Type Units (Not Binding)
HSLS - 18dB(A) Insertion Loss
The HSLS type Exhaust Gas Silencer is a simple energy converter. It utilises the exhaust gas noise energy to excite individual fibres of different lengths in the acoustic infill to create friction, resulting in heat energy to be formed, which is then dissipated by the outer silencer casing or into the exhaust gas.
The design also inadvertently uses the Helmholtz principle to increase the insertion loss to approximately 18 dB(A) performance to give an exhaust gas silencer with an exceptionally low pressure drop and good attenuation capabilities at 250 hertz and greater in the overall spectrum.