Vesda VLF-500 (VLF-500-00) Very Early Warning Smoke DetectorThe VESDA VLF 500 detector is a very early warning smoke detector designed to protect small, business critical environments of less than 500 m (5,380 sq. ft.) The detector works by continually drawing air into sampling holes in a pipe network. The air is filtered and passed into a detection chamber where light scattering technology detects the presence of very small amounts of smoke. Detector status information is communicated on the detector display