Denzel Washington on screen and stage. Denzel Washington is an American actor who made his feature film debut in Carbon Copy (1981).[1] In 1982, Washington made his first appearance in the medical drama St. Elsewhere as Dr. Philip Chandler.
Report Abuse. Sprinklers do not detect smoke. Some operate by a fuse that melts, from the heat of a fire, to release water, others operate by a sudden drop in water or air pressure in the pipe which is controlled by a alarm system, when activated.
Some vacuums also use HEPA filters to reduce particles returned to the air. How HEPA Filters Clean the Air. A HEPA filter works when the air pushes through it. The filter's ultra-fine mesh catches 99.7 percent of all particles 0.3 microns or smaller, which includes tobacco smoke, pet dander, mold spores, dust mites, and pollen, according to WebMD.