{"product_id":"system-sensor-d4120-duct-mounted-smoke-detector","title":"System Sensor D4120 Duct Mounted Smoke Detector","description":"\u003ch3 class=\"PDq2pG_selectionAnchorContainer\"\u003eDescription:\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003eThe System Sensor D4120 duct mounted \u003ca href=\"https:\/\/plgautomation.com\/collections\/safety-components\"\u003esmoke detector\u003c\/a\u003e is used in HVAC fire detection and life safety systems. Commonly installed in air handling units, ventilation ducts, commercial buildings, and industrial facilities. Maintenance teams and system integrators use this part for repair, retrofit, expansion, and replacement.\u003c\/p\u003e\n\u003ch3\u003eApplications:\u003c\/h3\u003e\n\u003cp\u003eThe System Sensor D4120 duct mounted smoke detector is designed to detect smoke in HVAC ductwork and initiate alarm or shutdown functions to prevent smoke circulation throughout a building. It is commonly used in ventilation systems, air handling equipment, manufacturing facilities, and commercial properties where reliable smoke detection and fire protection are required.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp\u003e• Brand: System Sensor\u003cbr\u003e• Part number: D4120\u003cbr\u003e• Product type: Duct mounted smoke detector\u003cbr\u003e• Series: InnovairFlex\u003cbr\u003e• Detection technology: Photoelectric smoke detection\u003cbr\u003e• Wiring configuration: Four-wire\u003cbr\u003e• Air velocity range: 100 to 4,000 ft\/min (0.5 to 20.3 m\/s)\u003cbr\u003e• Operating voltage: 20–29 VDC, 24 VAC, or 120 VAC\u003cbr\u003e• Operating temperature: -4°F to 158°F (-20°C to 70°C)\u003cbr\u003e• Humidity range: 0% to 95% non-condensing\u003cbr\u003e• Mounting type: Round or rectangular duct mounting\u003cbr\u003e• Relay configuration: DPDT alarm relay and SPST trouble relay\u003cbr\u003e• Application: HVAC smoke detection and fire protection systems \u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp\u003e• System Sensor D4120W\u003cbr\u003e• System Sensor DNR\u003cbr\u003e• System Sensor DH100ACDC\u003c\/p\u003e","brand":"System","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51713738703150,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_b60fb1e4-3d46-41fe-a057-fe4a31912d38.jpg?v=1770406638","url":"https:\/\/plgautomation.com\/products\/system-sensor-d4120-duct-mounted-smoke-detector","provider":"PLG Automation ","version":"1.0","type":"link"}