HEMCO’s U.L. 1805 Classified LE Constant Volume Fume Hood is available in 3, 4, 5, 6, and 8 ft widths. The fume hood incorporates a unitized superstructure with non-metallic dual wall construction for total chemical resistance, strength and durability. An integral one-piece fume chamber is glass smooth with all coved corners. The VaraFlow baffle system directs the air through the fume chamber and through the exhaust outlet with minimum turbulence and maximum airflow efficiency. The fume hoods are certified to: ASHRAE-110, NFPA-45, U.L. 1805 Classified and SEFA Recommended Practices.