UniFlow LE Airestream fume hoods are a high-efficiency, full duty, low flow constant volume for energy savings & maximum user protection. The aerodynamic face opening with airfoil provides uniform air flow through the fume chamber. The Vector baffle system directs the air through the fume chamber to the bell shaped exhaust collar with minimum turbulence. The fume hood has a non-metallic construction (NO RUST) for total chemical resistance, superior durability and long life. Fume hood is U.L.1805 classified