Constant Air Volume [CAV] or Variable Air Volume [VAV] systems to guarantee full operator protection against hazardous substances. Negative pressure, sustained by a remote exhaust fan, ensures a constant, safe inflow of air inside the working chamber.
CAV | Constant Airflow Volume
Designed using the traditional bypass system which incorporates openings above the sash, a constant air volume fume cupboard (CAV) provides a constant flow of air, whether the cupboard is in use or if the sash is open or closed. The face velocity will stay constant but the exhaust rate and therefore energy usage stays constant.
VAV | Variable Airflow Volume
In contract, a non-bypass VAV system reduces the volume of air taken from the fume cupboard when it’s not being used and the sash is closed. This results in much better energy consumption compared to a CAV system, reducing carbon emissions and potentially saving money. VAV systems are also available with automatic front sash closure systems helping to save even more energy consumption.