23 38 00 VENTILATION HOODS

.01 Fume Hood Exhaust Systems

1. All systems shall have an adequate supply of make-up air tempered to room temperature.  Auxiliary air hoods shall not be used.  Total make-up air quantity shall not exceed that required to maintain the specified pressure relationship for the space.
2. Exhaust fans serving fume hoods shall be located at the discharge end of the system.  For additional information see Division 11 53 13 - Laboratory Fume Hoods.
3. Exhaust fans shall discharge a sufficient height above the roof level to provide safe discharge and dilution of hazardous chemicals.  System design shall meet ANSI/AIHA Z9.5.
4. Duct systems and fans serving hoods used with combustible materials shall be of spark-proof construction.
5. Use Type 316 stainless steel (welded), FRP or PVC.  Suitability of duct material shall be verified with the University.
6. Hoods, fans, and discharges shall be tagged for type of service and location of hood and fan.  Fume hoods shall be tagged to match serving fan tag.
7. Exhaust fans and ductwork handling toxic fumes and/or radioisotopes shall have a self-adhering CAUTION sticker attached.
8. Exhaust stacks shall be designed according to the latest edition of the ASHRAE Fundamentals Handbook, Airflow Around Buildings.