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The D4120 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to round orThis manual is available online at systemsensor.com. NFPA Standards 72 and 90A should also be referenced for detailed information. NOTICE: This manual shall The InnovairFlex D4120 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to User guide • Read online or download PDF • System Sensor D4120, D4P120, and D4S User Manual • System Sensor Equipment. With its 2:1 sensor-to-power capability, the power board of the D4120 may be used *Please refer to the corresponding installation manual for accessory Document Type, Download Link ; Catalog, D4120_Catalog (pdf) ; Specification Sheet, D4120_Specification Sheet (pdf) ; Instruction/Installation Manual D4120 Footprint Dimensions: Rectangular - 14.38 in L x 5 in W x 2.5 in D (37cm L x 12.7cm W x 6.36cm System Sensor D4120, D4P120, and D4S Product manual.