Vents and hood fans for appliances will not function effectively if the indoor air pressure is lower than the outdoor pressure. Operating the fans may actually contribute to the lower indoor air pressure. Most air cleaners remove only particulate pollutants suspended in air. They do not remove particles that have settled onto furniture, floors, and other surfaces. Some types produce ozone, a pollutant that irritates the lungs, if not properly installed and maintained.
Some air cleaners can remove inhalable particulates.
A few are designed to remove gaseous pollutants. Lewis Publishers, Inc., 1985.U.S. Environmental Protection Agency. Introduction to Indoor Air Quality. National Environmental Health Association, 1991.