Smoke introduced into an air duct system will be distributed throughout the entire building. Bk d4120 the system sensor d4120 4 wire photoelectric low flow duct smoke detector senses smoke in the most challenging conditions operating in airflow speeds of 100 to 4 000 feet per minute temperatures of 4f to 158f and a humidity range of 0 to 95 percent non condensing. D4120 products system sensor system sensor. 
				
			
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