Auxiliary Air Fume Hood

Auxiliary air hoods uses exhaust air from two sources, the room supply air and an auxiliary supply air from outside. The proportion of this auxiliary air mix may vary from 30 to 70% of the total amount exhausted through the hood. The design would save considerable thermal energy particularly in the warmer months of the year. These hoods reduce the volume of conditioned room air exhausted there by reducing the overall cooling load. Make up air to the auxiliary air hood should be heated during the heating season so that cold, moist, dense outside air does not fall below the face opening. The hood exhaust volume and the room air balance essentially is unchanged even when the sash is fully closed. The by-pass hood operates at constant volume.

When the auxiliary air is introduced across or infront of the opening the flow pattern of the auxiliary air stream is critical to hood performance. The air balance must be carefully maintained for proper hood performance.

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
  • Adjustable baffle slots at top and bottom. Bottom slots covered with epoxy powder coated stainless steel screen behind baffle.
  • 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.
  • Air intake plenum
  • Two tube fluorescent light fixture to generate 100 feet candles of illumination inside hood. Relamping can be done from outside of hood front.
Auxiliary Air Hood