The intention of this document is to set a standard for the design, construction, maintenance, and use of laboratory ventilation in order to maintain acceptable air quality in the laboratory building and surrounding areas. This standard outlines criteria for stack heights, exhaust exit velocities, and design considerations that shall be addressed and implemented at the University of Massachusetts/Amherst. Together with design standards established by Facilities Planning, this document will determine requirements for laboratory exhaust ventilation systems. These requirements do not preclude adherence to good engineering practices, the Massachusetts Building Code and standards referenced therein. These requirements will be included in contract specifications for all future contracts submitted by the University of Massachusetts/Amherst. The University will only accept bids which meet these specifications on future contracts.