Vesda VSP-722 Replacement AspiratorThe VESDA VLF 250 detector is a very early warning smoke detector designed to protect small, business critical environments of less than 250 m (2,690 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