In most laboratories, the fume hood is the primary device for the control of exposures to hazardous substances as it provides containment of operations which may release harmful gases, vapours or aerosols. The University of Toronto Laboratory Fume Hood Standard requires that these devices be appropriately selected, installed, used and maintained such that the health of laboratory workers is safeguarded.
The intensity of air flow in a fume hood will increase as the fume hood sash is raised. Fans, located in the ceiling, will then draw extra fresh air into the room in order to compensate for the increased air loss by way of the fume hood.
Air flow can also be increased by pressing the red "Set-Reset" button on the control panel AND the grey "mute" button (the "mute" button shuts off the alarm). This procedure should NOT be done on a regular basis.