Variable Air Volume (specify -VAV at the end of the hood part number ex. 5SA70B-VAV)
Designed to limit the bypass area, typically used in conjunction when VAV exhaust systems are installed on the building’s HVAC system
VAV is a type of fume hood exhaust system that typically maintains constant fume hood face velocity by adjusting blower motor speed or a balance damper in response to changes in the sash position