Specifications Manual
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  • The Federal Signal Models 55 and 56 are electric horns which produce sound by means of a diaphragm, which resonates a column of air.

    Because the output is greater than that of a vibrating horn resonating horns can be used wherever a louder, more powerful signal is required.


  • - Resonated column of air generates sound
    - Produces 105dBa @ 10' (115dBa @ 1m)
    - Indoor/outdoor use

  • Both models feature corrosion-resistant cast aluminum housings with a brass projector. These projectors are designed to match the frequency of the vibrating diaphragm to produce a smooth musical tone. The housings are tapped for 1/2 inch conduit (swivel bracket included).

    Models 55 and 56 are finished in gray enamel and equipped with a straight projector. These weatherproof horns are water and dust-tight when installed with conduit.

    Model 55 is also UL (Underwriters Laboratories) Listed and CSA (Canadian Standards Association) Certified for indoor/outdoor use. Both models are FM Approved. Models 55 and 56 have a duty cycle of five minutes on, five minutes off.

    Models 55 and 56 are ideal for both indoor and outdoor use. They require minimum maintenance; their rugged designs seal out corrosive dust and vapors. Both models have sufficient output to penetrate through high ambient noise levels.

    • FM Approved
    • Model 55 (120VAC) is UL Listed and CSA Certified
  • Voltage 24VAC 60Hz
    120VAC 60Hz
    Mount Swivel Bracket
    Operating Current 3.0 Amps at 24VAC
    0.75 Amps at 120VAC
    Operating Temperature Minimum -35.00 °F
    Operating Temperature Maximum 150.00 °F
    Decibel Output 105 at 10 Feet
    115 at 1 Meter
    Duty Cycle 5 minutes ON, 5 minutes OFF
    Height 8.000 in
    Width 8.000 in
    Length 19.750 in

    For complete specifications please download the Specification Sheet.

  • Federal Signal

    When it comes to safety, security and effective communications for the most hazardous environments, the most demanding applications, Federal Signal stands out as your best source for total industrial solutions. The Federal Signal product line is universally recognized as both the broadest and deepest in the industry. Audible and visual signaling. Outdoor warning. Intercoms. Public address. Telephony. Initiating systems. Fire alarms. Uninterruptible power supplies. And more. In terms of comprehensive product coverage, no one beats Federal Signal. They don’t even come close.