- Designed for applications where concentration of airborne particles is controlled such as pharmaceutical medical and other critical manufacturing environments. - Large rubber o-ring to seal the grille to the ceiling - Rubber washers for all mounting hardware - Apolycarbonate dust shield located between the speaker and the grille - Built-in amplifier - Capable of reproducing voice paging in clean room environments - Screwdriver adjustable volume control located on the 1 watt amplifier circuit board - 8-inch speaker
