{"title":"Duct Smoke Detectors","description":"\u003cp\u003eHVAC duct smoke detectors for commercial fire alarm systems, installed on air handling units and return ducts to detect products of combustion in moving air and trigger fan shutdown per NFPA 90A.\u003c\/p\u003e\u003cp\u003eListed under UL 268A, the lineup includes System Sensor DNR, DH400, and D4120 housings together with Silent Knight SK-DUCT and Fire-Lite D365PL platforms, covering 2-wire and 4-wire addressable and conventional installations.\u003c\/p\u003e","products":[{"product_id":"system-sensor-dnr-duct-smoke-detector","title":"System Sensor DNR Duct Smoke Detector","description":"\u003cp\u003eSystem Sensor DNR conventional duct smoke detector. System Sensor (Honeywell brand) commercial fire-alarm device — compatible with Notifier, Gamewell-FCI, Silent Knight, and Fire-Lite control panels per device family.\u003c\/p\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":49662236459301,"sku":"DNR","price":156.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/system-sensor-duct-detectors-default-title-system-sensor-dnr-duct-detector-31897172803808.jpg?v=1771297467"},{"product_id":"system-sensor-d4120w","title":"System Sensor D4120W D4120 4-Wire Duct Smoke Detector","description":"\u003cp\u003eSystem Sensor D4120W D4120 4-wire conventional duct smoke detector. System Sensor (Honeywell brand) commercial fire-alarm device — compatible with Notifier, Gamewell-FCI, Silent Knight, and Fire-Lite control panels per device family.\u003c\/p\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":51722993533221,"sku":"D4120W","price":272.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/system-sensor-duct-detectors-default-title-system-sensor-d4120w-duct-smoke-detector-4-wire-33531346780384.jpg?v=1771297288"},{"product_id":"system-sensor-d4120","title":"System Sensor D4120 D4120 4-Wire Duct Smoke Detector","description":"\u003cp\u003eSystem Sensor D4120 D4120 4-wire conventional duct smoke detector. System Sensor (Honeywell brand) commercial fire-alarm device — compatible with Notifier, Gamewell-FCI, Silent Knight, and Fire-Lite control panels per device family.\u003c\/p\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":51722996613413,"sku":"D4120","price":219.51,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/system-sensor-duct-detectors-default-title-system-sensor-d4120-duct-smoke-detector-32027911061728.jpg?v=1771297214"},{"product_id":"simplex-4098-9755","title":"Simplex 4098-9755 TrueAlarm Analog Addressable Device","description":"\u003cp\u003eSimplex 4098-9755 TrueAlarm analog addressable detection device. TrueAlarm analog addressable detection. Compatible with Simplex 4100ES, 4010ES, 4007ES, and 4100U fire alarm control panels using IDNet SLC.\u003c\/p\u003e","brand":"Simplex","offers":[{"title":"Default Title","offer_id":52004328374565,"sku":"4098-9755","price":195.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/simplex-duct-detectors-default-title-simplex-4098-9755-2-wire-duct-detector-31897058443488.jpg?v=1771296688"},{"product_id":"silent-knight-sk-duct-w","title":"Silent Knight SK-DUCT-W Duct Smoke Detector Housing","description":"\u003cp\u003eSilent Knight SK-DUCT-W Duct Smoke Detector Housing.\u003c\/p\u003e\n\u003ch3\u003eCompliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUL Listed\u003c\/li\u003e\n\u003cli\u003eFM Approved\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHousing accepts SK-protocol addressable detector heads for HVAC duct installation\u003c\/li\u003e\n\u003cli\u003eAirflow sampling range 100 to 4,000 ft\/min (0.5 to 20.3 m\/s)\u003c\/li\u003e\n\u003cli\u003eHumidity range 0% to 93%\u003c\/li\u003e\n\u003cli\u003eWeight 1.6 lb (0.73 kg); mounts to standard duct openings\u003c\/li\u003e\n\u003cli\u003eIncludes sampling tubes for drawing air from the duct airstream to the sensing chamber\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SK-DUCT-W is an addressable duct smoke detector housing for mounting in HVAC air handling unit ductwork. It accommodates compatible SK-series detector heads and reports to the Silent Knight 5820XL or 6500 series fire alarm control panels (a Honeywell brand) via the SK protocol SLC. Per NFPA 72, duct smoke detectors initiate HVAC shutdown to prevent smoke recirculation throughout a building. Check the installed detector head model for specific duct airflow and sampling tube requirements.\u003c\/p\u003e\n\u003cp\u003eVerify panel\/device family compatibility before ordering.\u003c\/p\u003e","brand":"Silent Knight","offers":[{"title":"Default Title","offer_id":52004329029925,"sku":"SK-DUCT-W","price":274.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/silent-knight-duct-detectors-default-title-silent-knight-sk-duct-w-intelligent-photoelectric-duct-smoke-detector-32276215103712.jpg?v=1771296676"},{"product_id":"fire-lite-d365pl","title":"Fire-Lite D365PL Duct Detector","description":"\u003cp\u003eFire-Lite D365PL Duct Detector.\u003c\/p\u003e\n\u003ch3\u003eCompliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUL listed\u003c\/li\u003e\n\u003cli\u003eFM approved\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e Photoelectric, integrated low-flow technology\u003c\/li\u003e\n\u003cli\u003e Air velocity rating from 100 ft\/min – 4,000 ft\/min (0.5 m\/s – 20.32\u003c\/li\u003e\n\u003cli\u003e Versatile mounting options: square or rectangular configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eVerify panel\/device family compatibility before ordering.\u003c\/p\u003e","brand":"Fire-Lite","offers":[{"title":"Default Title","offer_id":52004333551909,"sku":"D365PL","price":287.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/fire-lite-duct-detectors-default-title-fire-lite-d365pl-duct-detector-replaces-d355pl-32336197583072.jpg?v=1771296599"},{"product_id":"silent-knight-ductcov","title":"Silent Knight DUCTCOV Duct Detector","description":"\u003cp\u003eSilent Knight DUCTCOV Duct Detector Cover.\u003c\/p\u003e\n\u003ch3\u003eCompliance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUL Listed\u003c\/li\u003e\n\u003cli\u003eNFPA 72\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eProtective cover accessory for Silent Knight duct smoke detector housings\u003c\/li\u003e\n\u003cli\u003eShields the sampling chamber from dust, debris, and physical contact during construction\u003c\/li\u003e\n\u003cli\u003ePlastic construction sized to fit SK-series duct detector housings\u003c\/li\u003e\n\u003cli\u003eField-replaceable to keep sampling airflow paths unobstructed\u003c\/li\u003e\n\u003cli\u003eDesigned for use with the SK-DUCT-W duct smoke detector housing on SK protocol systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe DUCTCOV is a cover accessory for Silent Knight duct smoke detector installations (a Honeywell brand). Duct detectors mount in HVAC ductwork where they sample airflow through perforated sampling tubes; protective covers help maintain sampling chamber cleanliness during construction phases or in dusty environments where unfiltered airflow could foul the detection chamber. Compatible with SK-DUCT-W housings supervised by the 5820XL or 6500 series fire alarm control panels via the SK protocol SLC. Confirm fit against the host duct detector housing model before ordering.\u003c\/p\u003e\n\u003cp\u003eVerify panel\/device family compatibility before ordering.\u003c\/p\u003e","brand":"Silent Knight","offers":[{"title":"Default Title","offer_id":52004336697637,"sku":"DUCTCOV","price":16.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/FL-DUCTCOV.jpg?v=1771302068"},{"product_id":"simplex-4098-9750","title":"Simplex 4098-9750 TrueAlarm Analog Addressable Device","description":"\u003cp\u003eSimplex 4098-9750 TrueAlarm analog addressable detection device. TrueAlarm analog addressable detection. Compatible with Simplex 4100ES, 4010ES, 4007ES, and 4100U fire alarm control panels using IDNet SLC.\u003c\/p\u003e","brand":"Simplex","offers":[{"title":"Default Title","offer_id":52004351279397,"sku":"4098-9750","price":205.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/simplex-duct-detectors-default-title-simplex-4098-9750-ssd-in-duct-sensor-31897050710240.jpg?v=1771296362"},{"product_id":"edwards-siga-dts","title":"Edwards SIGA-DTS SIGA Addressable Device","description":"\u003cp\u003eEdwards SIGA-DTS Signature Series intelligent addressable device. Edwards Signature Series (SIGA) intelligent addressable + EST3 modular control system + Genesis notification appliances. Requires Edwards EST3 \/ iO64 \/ iO500 \/ iX3 fire alarm control panels.\u003c\/p\u003e","brand":"Edwards","offers":[{"title":"Default Title","offer_id":52004391059749,"sku":"SIGA-DTS","price":127.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/7648\/4645\/files\/edwards-duct-detectors-default-title-edwards-siga-dts-duct-smoke-detector-test-station-31896771625184.jpg?v=1771295783"}],"url":"https:\/\/fastalarmdistribution.com\/collections\/duct-detectors.oembed","provider":"Fast Alarm Distribution","version":"1.0","type":"link"}