- Description
- Specifications
Low-Profile 2-Wire Photoelectric Smoke Detector with Built-In Sounder, Magnetic Test Feature, and NFPA 72 Compliance
The NAPCO FW-2S is a 2-wire photoelectric smoke detector with a built-in sounder that connects directly to conventional fire alarm systems on a single pair of wires. The detector stands just 1.8 inches tall in an ultra-low-profile housing that sits flush against ceilings in finished spaces, and the non-directional smoke chamber eliminates the need to orient the detector toward any particular area during installation. A pulsed LED light source paired with a silicon photodiode receiver provides reliable photoelectric smoke detection, and the built-in sounder delivers local audible notification at the point of detection.
The FW-2S is designed for NAPCO fire alarm panels and compatible 2-wire conventional systems where installers need a dependable detector that simplifies both installation and long-term maintenance. The removable smoke labyrinth allows field cleaning without replacing the detector head, the tamper-resistant locking feature prevents unauthorized removal, and the magnetic Go/No-Go test capability lets technicians verify detector operation during inspections without climbing a ladder with aerosol cans. Automatic sensitivity verification meets NFPA 72 Chapter 7 standards for ongoing compliance.
Where the FW-2S Fits
- Commercial office buildings, retail spaces, and hotels where the 1.8-inch low-profile housing blends into finished ceilings without drawing attention, the 2-wire connection minimizes wiring labor on new construction and retrofit projects, and the built-in sounder provides immediate local notification at the point of detection
- Schools, hospitals, and assisted living facilities where tamper-resistant locking prevents unauthorized removal in high-traffic areas, the magnetic test feature allows inspectors to verify every detector during annual NFPA 72 testing without disrupting occupied spaces, and the removable labyrinth simplifies cleaning on routine maintenance schedules
- Apartment buildings, condominiums, and multi-family housing where photoelectric detection reduces nuisance alarms from cooking compared to ionization detectors, the non-directional chamber design means the detector works regardless of mounting orientation, and the low-profile housing keeps ceilings clean in residential-grade finishes
What the FW-2S Delivers
- Photoelectric Smoke Detection: Pulsed LED light source with silicon photodiode receiver detects smoke particles through light scattering in a non-directional chamber. Two consecutive high-level signals within a short period trigger the alarm circuitry, reducing false activations from transient conditions. LED indicator remains lit during active alarm for visual confirmation.
- 2-Wire Operation with Built-In Sounder: Connects to conventional fire alarm panels on a single pair of wires for power, supervision, and alarm signaling. Built-in sounder provides local audible notification at the detector location. Operating voltage range of 8 to 35 VDC accommodates a wide range of panel configurations.
- Ultra-Low 1.8-Inch Profile: Compact housing stands just 1.8 inches from the mounting surface for a flush appearance on finished ceilings. Tamper-resistant locking feature secures the detector to the base and prevents unauthorized removal in public and institutional spaces.
- Magnetic Test and NFPA 72 Compliance: Magnetic Go/No-Go test allows technicians to verify detector function without aerosol sprays or ladder-mounted tools. Automatic sensitivity window verification meets NFPA 72 Chapter 7 standards for ongoing inspection compliance. Removable smoke labyrinth for field cleaning and maintenance. UL Listed.
