Category:Pneumatic Sirens

Pneumatic sirens differ from electromechanical sirens by requiring an external supply of compressed air in order to function. The air is usually supplied by a compressor or blower, which is fed through a disc-shaped chopper to spin it at a high speed and create the sound. Pneumatic sirens reach full volume quickly, and due to the nature of how they operate, they are silenced immediately upon the compressor shutting off, leading to a near nonexistent winddown. Pneumatic sirens typically cannot operate without an external air supply.

Not to be confused with supercharged sirens, which use an external source of compressed air alongside a standard electromechanical siren core. Pneumatic sirens have unpowered rotors, spun by the high pressure of the air flowing through the ports.