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ACA Allertor 125

An ACA Allertor 125

The ACA Allertor is an outdoor civil defense siren made by Alerting Communicators of America (ACA) that used to be the Biersach & Niedermeyer Co. (B&N Co.) which produced a similar, older version of this siren called the Mobil Directo. This Siren was in production from 1967 to 1981. It had a unique design have the intake chopper on the bottom, and the sound coming from the top horn.

History Edit

The ACA Allertor was originally the the Mobil Directo by the Biersach & Niedermeyer Co. in the early 1940s. The Mobil Directo's main function was to warn of the event of an air-raid. The Mobil Directo was made of metal and came in 4 different port ratios: 8, 8/12, 9/12, and 10/12; 9/12 was the most common. The ACA Allertor sound would go up to 125 db at 100 feet away which is why it's called the ACA Allertor "125". In 1968, B&N changed their name to ACA and started producing Allertors.