Fume Hood superstructures have a double wall construction consisting of an outer shell of sheet steel and an inner liner of corrosion resistant material as specified. Attachment of the interior lining material to the steel framing members is made with non-metallic
fasteners.
The double wall shall house and conceal steel framing members, attaching brackets and remote operating service fixture valves. The exterior side panels of the superstructure are constructed of 18 gauge steel and are removable for access into the interior housing. Access may also be gained through removable panels in the interior liner.
Each superstructure shall have an internal baffle system of the same material as the interior liner. This baffle system shall provide for safe efficient removal of fumes when the superstructure is connected to a properly installed exhaust system. A manual adjustment is provided on the upper part of the baffle to allow the operator to set the Fume Hood for heavy or light fumes.
All baffles are removable for cleaning. Unless specified for use in variable air volume (VAV) system, the superstructures shall be provided with an air bypass feature. The bypass, located at the upper front interior of the Hood, shall open as the sash is lowered, providing for a relatively constant exhaust volume of the Fume Hood superstructure.
When specified, the upper front exterior panel of the superstructure can be furnished with louvers. The louvers provide for proper operation of the bypass feature when the top of the superstructure is closed off to the ceiling.
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