Exhaust Laboratory Fume Hood The Exhaust Laboratory Fume Hood is synonymous with standard bypass design, exhausting a constant volume of air, irrespective of the sash position. Constructed with an advanced airfoil design, the overall safety and performance of the flame hood are excellent and proficient. The rolled-entry design of the hood ensures zero flow of the eddy currents and reverse flow from the hood. There is an excellent provision for the removal of heavy gases or evaporation from a spill. We offer these exhaust flame hoods in different capacities and specifications. Built with microprocessor controllers, these flame hoods are equipped with easy-access utility panels for easy maintenance and operation.