Constructed of durable fiberglass which is both fire retardant and chemical resistant. Construction features include double walls to reduce sound and vibration and a seamless interior with covered corners for easy cleaning. The upper sash has 1/4" thick safety glass with vertical counter-balanced suspension while the lower sashes are hinged 1/4" thick shatter-proof Plexiglas. The Uni Flow Walk-In Hood is available in an explosion proof model.