Some factors to consider when selecting a fume hood include velocity, energy consumption and surface material. Hemco’s new U.L. 1805 Classified LE Constant Volume Fume Hood incorporates a unitized superstructure with non-metallic wall construction for total chemical resistance, strength and durability. The one-piece fume chamber is glass-smooth will 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. ASHRAE-110, NFPA-45, U.L. 1805 Classified and SEFA recommended practices. Multiple widths are available. Hemco Corporation