Laboratory Fume Exhaust hoods are readily available in metal construction with inner FRP lining or in complete FRP constructions. Heavy-duty and dynamically balanced blower assembly provided in the unit removes smoke fumes odor from any chemical process conducted in the hood. Work surface of these Fume Hoods is equipped with acid proof ceramic lining or with finely polished granite. The front sash is connected to suitably balanced counter weigh for convenient vertical sliding.