RIE or RIS silencers are multi-chamber reactive units for applications where good broad-band performance is required. These industrial grade silencers have a low pressure drop and are available with side or end entry or side inlet and outlet. They can be installed in any orientation without loss of acoustic performance.

These silencers are suitable for process plant noise control and for the exhaust of two or four stroke diesel engines when used as emergency power generators, pumping sets and mobile compressors. Their good low frequency performance enables these units to be used in most situations to provide reductions of approximately 20-25 dB(A).

NAP RIE and RIS industrial silencers are dual chamber reactive type silencers tuned for medium performance. The RIE silencer has an overall performance of 20-25 dB(A) for more stringent noise control requirements especially at low and mid frequencies. The silencers have low pressure drop for minimal resistance.