VENTILATION

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VENTILATION
Presentation by Pam Fatland Manager, Chemical
Safety Office of Environmental Health
Safety Tulane University [phone] January,
2004
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PROTECT THE WORKER

• Chemical Fume Hoods
• 100 Exhausted to outside
• No recirculation
• Baffles in back should adjust for work with
  chemicals of different volatilities and vapor
  densities
• Designed for work with toxic or hazardous
  chemicals

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PROTECT THE WORKER

• Radiation Fume Hoods
• 100 Exhausted to outside
• May contain HEPA filters (esp. for work with
  Iodine isotopes)
• Usually stainless steel construction
• Usually reinforced for heavy lead shielding
• Designed for work with radioactive materials

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PROTECT THE WORKER

• Perchloric Acid Fume Hoods
• 100 Exhausted to outside
• Special washdown features to prevent perchlorate
  buildup in hood and ductwork
• Not to be used for flammables or other chemicals
  reactive with perchlorates
• Designed for work with perchloric acid

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PROTECT THE WORKER

• Slot Ventilation
• 100 Exhausted to outside
• Draws fumes towards back of work space away from
  workers breathing zone

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PROTECT THE WORKER

• Canopy Ventilation
• May be 100 Exhausted to outside, but not
  recommended for chemical use
• Draws fumes past workers breathing zone
• Best used for heat removal such as in a kitchen

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PROTECT THE WORKER, THE PRODUCT, AND THE
ENVIRONMENT

• Class IIA Biological Safety Cabinet
• Most commonly used BSC, suitable for procedures
  with clinical specimens or cell cultures
• Some air is recirculated within cabinet through
  HEPA filter, some air is exhausted back into lab
  through another HEPA filter
• Do not use toxic or flammable materials