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Fume Hood Location

  • Fume hoods must not be located adjacent to a single means of access to an exit or in high traffic areas.
  • Locate away from doors, operable windows, and in general located to minimize cross drafts and air disruption Swinging doors are prohibited in rooms with chemical hoods.
  • Supply air diffusers air jet velocity shall be less than half (preferably less than one third) of capture velocity of the exhaust hood.


  • Chemical hood exhaust discharges must be designed to minimize air re-entry, take into account aesthetic appearance, and minimize exposures to maintenance workers.
  • Locate fans on roof or in a separate room (penthouse) that is maintained at a negative pressure to the rest of the building and is well ventilated.
  • A motion/light sensor may be utilized to lower exhaust rate to 60 linear feet per minute when fume hood is not in use.
  • Exhaust system must be constructed entirely of non-combustible materials; all duct work shall have welded seams and made of materials resistant to acids, bases, solvents and corrosive gases.

Sound Levels

  • Chemical hood exhaust systems must be designed to minimize sound level problems.
  • Designed to keep noise levels less than 68 db(A) one foot in front of hood face with hoods running.

Energy Efficiency

See guidelines and standards related to HVAC.

Approved by UK Design Guidelines & Technical Standards Committee June 18, 1998.