{"product_id":"kidde-kf21-sentry-mains-ac-optical-smoke-alarm-9v-alkaline-battery-back-up-with-quick-fit-base","title":"Kidde KF21 Sentry Mains Powered Optical Smoke Alarm with 9V Alkaline Battery Back-Up c\/w Quick Fit Base","description":"\u003ch1\u003eKidde KF21 Sentry Mains Powered Optical Smoke Alarm with 9V Battery Back-Up\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eKidde KF21 Sentry Optical Smoke Alarm\u003c\/strong\u003e is a reliable mains-powered smoke detector designed to provide early warning of slow, smouldering fires within residential properties. Featuring an advanced optical sensor, the KF21 is ideal for hallways, landings, bedrooms, living areas and loft spaces, helping to improve fire safety throughout the home.\u003c\/p\u003e\n\u003cp\u003eThis interconnectable smoke alarm can be linked with up to 23 compatible Kidde FIREX smoke, heat and carbon monoxide alarms, ensuring that when one alarm detects danger, all connected alarms sound simultaneously for maximum protection.\u003c\/p\u003e\n\u003cp\u003eDesigned with installers in mind, the KF21 includes a \u003cstrong\u003eQuick-Fit Slide-On Base\u003c\/strong\u003e for fast and tidy installation, while the 150mm flared base plate neatly covers marks left by larger existing alarms during retrofit projects.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMains-powered optical smoke alarm with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003eInterconnects with up to 23 compatible Kidde FIREX alarms\u003c\/li\u003e\n\u003cli\u003eAdvanced optical sensor for detecting slow, smouldering fires\u003c\/li\u003e\n\u003cli\u003eQuick-Fit Slide-On Base for rapid installation\u003c\/li\u003e\n\u003cli\u003e150mm flared base plate for clean retrofitting\u003c\/li\u003e\n\u003cli\u003eIntegrated cable management for secure and tidy wiring\u003c\/li\u003e\n\u003cli\u003eAlarm memory identifies the triggered alarm within the network\u003c\/li\u003e\n\u003cli\u003eCombined Test\/Hush button for testing and silencing nuisance alarms\u003c\/li\u003e\n\u003cli\u003eAuto reset following alarm activation\u003c\/li\u003e\n\u003cli\u003eTamper-resistant locking mechanism\u003c\/li\u003e\n\u003cli\u003eSuitable for lofts, hallways, bedrooms and living rooms\u003c\/li\u003e\n\u003cli\u003eFully compatible with Kidde FIREX smoke, heat and CO alarms\u003c\/li\u003e\n\u003cli\u003e10-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF21 optical smoke alarm is suitable for installation in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHallways and circulation routes\u003c\/li\u003e\n\u003cli\u003eBedrooms\u003c\/li\u003e\n\u003cli\u003eLiving rooms\u003c\/li\u003e\n\u003cli\u003eAttics and loft spaces\u003c\/li\u003e\n\u003cli\u003eResidential properties requiring Grade D2 fire detection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eOptical smoke alarms are particularly effective at detecting slow-burning fires caused by upholstery, electrical faults or cigarettes, making them ideal for living spaces and escape routes.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KF21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 230V mains with 9V alkaline battery back-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Optical with dust compensation and bug screen\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Volume:\u003c\/strong\u003e Minimum 85dB at 3 metres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Frequency:\u003c\/strong\u003e 3.2 kHz typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterconnectivity:\u003c\/strong\u003e Up to 23 compatible alarms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlarm Grade:\u003c\/strong\u003e D2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e BSI certified to BS EN14604:2005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 150mm x 53mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 295g including battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity Range:\u003c\/strong\u003e Up to 93% RH non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompliance \u0026amp; Installation\u003c\/h2\u003e\n\u003cp\u003eThe Kidde KF21 complies with UK Building Regulations and BS 5839 Part 6 requirements for Grade D domestic fire alarm systems. Installation should be carried out by a qualified electrician. For kitchen installations, a dedicated Kidde FIREX heat alarm is recommended instead of a smoke alarm.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/h9KdZktsF9A?si=0K3hkDAtyg1YqcJD\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eData Sheet:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/cLZXN-22ToQPRSsziH882At4tMbmU8m8g_VkuEP2TCY.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Data Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstruction Manual:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/a.mktgcdn.com\/f\/4139856\/5E_Cqq3RopAzls8aPoJmvHQMeuuRxjlrsjQeILwJrPw.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDownload Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"Kidde","offers":[{"title":"Default Title","offer_id":58118395625856,"sku":"KF21","price":21.38,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/2349\/2557\/files\/width_1920_height_1920.png?v=1779200356","url":"https:\/\/westbasedirect.com\/products\/kidde-kf21-sentry-mains-ac-optical-smoke-alarm-9v-alkaline-battery-back-up-with-quick-fit-base","provider":"westbasedirect.com","version":"1.0","type":"link"}