Indoor/outdoor air warning horn 55, 56

Model 55 - 24VAC and 120VAC Model 56 - 24VDC, 125VDC and 250VDC Model 55 produces 105 dBa @ 10' (115 dBa @ 1m) Model 56 produces 106 dBa @ 10' (116 dBa @ 1m) Corrosion resistant cast aluminum housing and spun brass projector Indoor/outdoor use Weatherproof, water- and dust-tight Swivel bracket included Type 3R enclosure Model 55-120-1 is UL Listed and CSA Certified Features Models 55 and 56 are resonating horns that produce sound by means of a diaphragm, which resonates a column of air. With greater output than a vibrating horn, the resonating horn can be used wherever a louder, more powerful alert is needed. These projectors are designed to match the frequency of the vibrating diaphragm to produce a smooth tone. The housings are tapped for 1/2" conduit. Models 55 and 56 have sufficient output to penetrate through high ambient noise levels and have a duty cycle of five minutes on, five minutes off.