HEMCO Corporation's LE Low Flow Constant Volume Fume Hood. Offered in 3 foot, 4 foot, 5 foot, 6 foot, and 8 foot widths the HEMCO LE fume hood incorporates a UniFlow superstructure, which provides unitized composite construction for superior chemical resistance, and strength. The VaraFlow baffle system directs the air through the fume chamber and through the exhaust outlet with minimum turbulence and maximum airflow efficiency.