Profile: B M C/Industrial Educational Service, Inc. is a manufacturer of laboratory casework, fume hoods and accessories. Our product line includes case work, fume hoods, work surfaces, fixtures & accessories, and flexible lab systems. Our airfoil variable air volume hoods (VAV) are designed to be used with exhaust control systems provided by other manufacturers. The upper bypass the VAV hood, has a lintel which restricts the air intake of the hood to the sash opening and lower bypass. The commercially available exhaust control system will detect the movement of the sash, and adjust the volume of air required to maintain a constant face velocity. Our airfoil bypass hoods have a double bypass to provide constant exhaust volume, and limit changes in face velocity. The upper bypass functions automatically with the raising and lowering of the sash. The lower bypass provides a continuous air sweep of the work surface.