GENERAL: The air horn shall be Model AHR-2 (dual projectors) [AHR-1 (single projector)] made by B&B Roadway, (888)
560-2060, or an approved equal meeting all specifications defined herein.
APPLICATIONS: The air horn shall be used as an aural signal to draw attention to operation of the bridge.
PROJECTORS: The projectors shall be of spun brass [option: chrome plated brass], approximately 18” (457mm) in
overall length each, and shall feature a diaphragm designed for high pressure operation and low air consumption. The
projectors [projector] shall be capable of producing a tone between 250 and 320 Hz with a decibel rating of 120db at 10
COMPRESSOR UNIT: Compressor motor shall be 1 HP, 120V, 60 Hz, 10.4 FLA. Compressor shall be a weatherproof,
rapid response, direct drive piston type compressor. Piston and cylinder shall be an oil-less, non-lubricated type, with a
Teflon compound piston ring. Compressor valves shall be stainless steel. Bearings shall be permanently sealed,
prelubricated ball type, requiring no maintenance. All components and fasteners shall be corrosion resistant.
MOUNTING: The standard air horn assembly shall be a single unit comprised of compressor and horns and shall be
suitable for outdoor mounting.
FIELD CONNECTIONS: The electrical contractor shall also provide a pushbutton or similar control device at the control
station for operation of the air horn.