Howden reactive dissipative attenuators provide a lower cost alternative for handling contaminated air and gas streams by incorporating both reactive chambers for attenuation of specific frequencies and absorptive fill material for broad band attenuation.
The splitters consist of a series of tuned acoustic chambers. Sound waves corresponding to the design frequencies are reflected out-of-phase to the incoming sound waves. As the reflected and incoming sound waves are directly opposite in their wave patterns, they have a cancelling effect on each other, reducing noise levels.
The upstream faces of the chambers are lined with absorptive fibreglass material to reduce broadband noise. The fibreglass is situated out of the air shielding it from contamination by particulate matter.