Vent: Swapped every old 4-wire can on a 40 unit job in Tucson from Feb to April and cut service calls from 6 a month to 1

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Vent: Swapped every old 4-wire can on a 40 unit job in Tucson from Feb to April and cut service calls from 6 a month to 1 | Alarm System Installers - SMM Buzz