Model 7

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Model 7 and 7T
Original advertisements (?) for the Model 7, circa. late 1970's
Company Federal Signal Corporation
Produced 1930s?-1988?
Type Electromechanical
Sound output 113 or 108[1] dBc at 100 feet
Frequency 690 (Single Tone) 690/517.5 (Dual Tone) [1] Hz
Horsepower 7.5[1]
Documentation Manual


The Model 7 was a 7.5 horse power, mechanical, omni-directional siren produced by Federal Signal Corporation. This siren is often confused with the Model 5 due to Federal Signal making a mistake in their naming scheme. Late Model 7s were called Model 5s by Federal Signal even though they were 7.5HP which pulls it out of line with their standard naming scheme based on horse power ratings.

Model 7 was available in 3 different chopper configurations: 8 port single tone, 12 port single tone, and 9/12 port dual tone. The siren was housed in a very simple enclosure that resembles an air vent found on building roofs. The housing came in either painted steel or stainless steel.

  1. 1.0 1.1 1.2 (PDF) Service Manual for Models 2, 7, SD10, STH10, STL10. Federal Signal Corporation. Retrieved October 22, 2017.