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This Firex KF20R is designed to detect smoke and provide an acoustic warning signal in the event of smoke or fire development. The product is used for fire detection in indoor spaces and is suitable for use in homes, hallways, and office environments. The detector operates on the basis of optical smoke detection and is connected to the 230-volt mains. To ensure continuous operation in case of power failure, the detector is equipped with three rechargeable lithium backup batteries. The detector can be wired to other Firex detectors. When one detector alarms, all linked detectors are activated simultaneously. The detector meets the requirements of NEN 2555 and is suitable for application in accordance with the Dutch Building Decree (Bouwbesluit). Applications • Smoke detection in homes • Smoke detection in hallways and landing areas • Smoke detection in office and practice rooms • Linked smoke detection in multiple rooms Specifications & features • Brand: Firex • Type: KF20R • Detection type: Optical smoke detection • Alarm sound level: 85 dB • Power supply: 230-volt mains • Backup battery: 3× rechargeable lithium battery (included) • Operation: Test button • Linkable: Yes, wired • Maximum linkable: Up to 24 detectors • End-of-life warning: Acoustic signal • Mounting: Ceiling mounting • Dimensions: 133 x 133 x 38 millimeters • Operating temperature: 0 °C to 40 °C • Relative humidity: 0% to 93% • Material: Plastic • Color: White • Certifications: EN 14604, NBN EN 14604, NEN 2555, BS-EN 14604:2005, CE Explanation of connection Mains power with rechargeable backup batteries means that the detector is connected to the 230-volt mains and, in the event of a power failure, automatically continues to function via internal rechargeable lithium batteries. Explanation of additional features Rechargeable lithium backup The detector is equipped with three rechargeable lithium batteries that are charged via mains power during normal use and automatically take over power in the event of a power outage. Wired linkable system The detector can be wired to other Firex detectors so that all detectors alarm simultaneously upon detection. Suitable for NEN 2555 / Building Decree The detector complies with the Dutch standard NEN 2555 and is suitable for application according to the Building Decree. Difference from KF20 When replacing a Firex KF20, the plug must be adjusted, as the KF20R uses a rechargeable lithium backup battery and requires a four-pin connection instead of the KF20's three-pin connection. Explanation of detection types Optical smoke detection works by measuring smoke particles in the air using a light source and sensor. When smoke disturbs the light beam, the alarm is activated. Thermal detection measures temperature changes and can be additionally applied within linked smoke and heat detector systems. Combination detection combines multiple detection methods within one alarm system. Carbon monoxide detection measures carbon monoxide gas and is intended for gas detection, not for smoke detection. Explanation of standards EN 14604 is the European product standard for smoke detectors and describes requirements for smoke detection, alarm volume, reliability, and test methods. NEN 2555 is the Dutch standard for smoke detectors in homes and aligns with requirements from the Building Decree. BS-EN 14604 is the British adoption of the European standard EN 14604. CE indicates that the product complies with the applicable European directives regarding safety, health, and environmental protection. Ask a product question