The TSHS has a primary dust separator in the form of a cyclone, which removes the bulk of the extracted dust, leaving relatively clean air to pass through a secondary cartridge fi lter, thus extending fi lter life. The TSHS has exceptionally low noise characteristics for use within the classroom and is designed for use with fi ne dusts. Warm air is returned to the classroom being sympathetic to environmental issues. A complete installation service is available from our engineers. These products require specialist installation & training. Please contact us for further information.