Catalog Datasheet MFG & Type PDF Document Tags; 2004 - A5053GM. Abstract: No abstract text available Text: annunciator, as well as remote test capability with the RTS451 or RTS451KEY Remote Test Stations. The SS-PD , Dimensions 14.750" (37 cm) length x 5.500" (14 cm) width x 2.750" (7 cm) deep. Options 1. Remote test and reset switch (Compatible with RTS451 /RTS151 and RTS451KEY /RTS151KEY test station) Smoke Detector Spacing On smooth ceilings, 30–60 feet between projected beams and not more than one-half that spacing between a projected beam and a sidewall. Other spacing may be used depending on ceiling height, airﬂow characteristics, and System Sensor D4240 4-Wire Photoelectric Low-Flow Smoke Detector The InnovairFlex D4240 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular ductwork. Addressable Smoke Detectors, Modules, and Pull Stations. New and available for immediate delivery. No charge for programming detectors and modules and Stations.