They can be vented or non-vented enclosures used primarily for storage of flammable or corrosive materials. If vented, the flammable storage cabinet is connected to the hood exhaust. The corrosive storage cabinet should be designed with a protective lining and secondary containment to inhibit chemical corrosion. It is highly recommended that these storage cabinets be vented either through the hood or through their own dedicated exhaust. Sash Sash is the term used to describe the movable glass panel that covers the face area of a fume hood.
Sashes can be vertical, horizontal, or a combination of the two.
Many hoods are installed with a sash stop, which stops the sash at approximately a 14 inch work level. Sash stops should never be removed, overridden, or modified. It is recommended that all lab work in a properly functioning fume hood be performed at the sash stop level or lower whenever possible. Alarms, sensors, controls, and gauges Many of the newer VAV hoods are installed with alarms, sensors, controls, and gauges. These features are included to provide lab personnel with a constant reading of fume hood performance.