EDWARDS SIGNALING, Photoelectric, Clear Plastic, Duct Smoke Detector - 1EYB5|SD-4WJ - Grainger
Duct Smoke Detector housing with photoelectric sensor - Buy Online - EC Products UK
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Duct Smoke Detectors: What are the code requirements? - Electrical Contractor Magazine
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53546-021APO - Duct Detector Housing (Series 65)
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Air Products and Controls SL-2000-P Photoelectric Duct Smoke Detector, 4-Wire, Universal Voltage - Amazon.com
