Variable Air volume Fume Hood

A Variable air volume (VAV) hood is designed to maintain a given face velocity regardless of its sash position. As the operator lowers the sash, face velocity is maintained while the overall hood exhaust is reduced. VAV systems allow fume hoods to reduce energy consumption while maintaining face velocity. A sensing device responds to changes in hood sash geometry and operates a volume control device (duct damper control device, duct discharge damper or a variable speed drive) to maintain the face velocity within the desired range.

VAV system are more dynamic than constant volume systems and may react to disturbances such as door opening, VAV systems require extensive instrumentation and control.VAV fume hoods have additional advantage of providing accurate monitoring and alarm capabilities at the hood. Accurate room pressurization control to match supply and exhaust flows must be part of the VAV hood system.

Standard Features
  • Epoxy Resin Cupsink a. left b. right
  • Cold Water Faucet
  • Gas Outlet
  • Air Outlet
  • Vacuum Outlet
Optional Features
  • Acid Storage Cabinet
  • Flammable storage Cabinet
  • Additional Service Fixtures
  • Exhaust Fan
  • Exhaust Fan Switch With Pilot Light
Specification
  • Designed according to the HOPEC IV characteristics
  • Double wall type fumehood superstructure. Exterior shell of 18 gauge zinc coated sheet in epoxy powder coated finish. Interior wall including baffle of Grade 1125 fiber reinforced thermoset resin sheet-White.
  • Sash enclosure to assure a leak free chamber.
  • No by-pass above the sash.
  • Two tube fluorescent light fixture to generate 100 feet candles of illumination inside hood. Relamping can be done from outside of hood front.
Variable Air volume Fume Hood