PHOTOELECTRIC SMOKE DETECTOR
OP121 SIEMENS Detector placement for a clear air, 0 to 4000 ft/min velocity application, use 30 foot center spacing (900 sq ft) from NFPA Standard 72 initiating devices chapter and CAN/ULC-S524 as a starting point for a detector installation layout. This spacing, however, is based on ideal conditions smooth ceiling, no air movement, and no physical obstructions. In some applications, considerably less area is protected adequately by each smoke detector. In all installations, place the detector on the ceiling, a minimum of 6 inches from a side wall, or on a wall, 6 inches from the ceiling.
TO AVOID NUISANCE ALARMS: DO NOT locate the OP121/OH121 detector where excessive smoke concentrations exist under normal conditions, or in areas of prolonged high relative humidity where condensation occurs.
DO NOT locate the OP121/OH121 detector next to an oil burner, kitchen, or garage where exhaust fumes can trigger an alarm. Other causes of false alarms are dust accumulation, heavy concentrations of steam, heavy pipe or cigar smoke, and certain aerosol sprays.
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