Design Criteria for Laboratories
Glossary of Terms
- Auxiliary air
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A fume hood system that provides direct outside air to the front of a fume hood to save energy by exhausting up to 70% of it directly to the outside through the hood instead of exhausting 100% of laboratory air directly out.
- Backsplash
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The raised portion of a laboratory counter that abuts to the wall at the back of the counter.
- Bypass
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The fume hood feature that provides an alternative route for air to pass through the top opening of a fume hood when the sash is closed, maintaining the prescribed (exhaust) airflow rate.
- Dead air pocket
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A space within a fume hood superstructure where air is moving either poorly or not at all.
- General-purpose
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A fume hood used to exhaust contaminants created from normal laboratory interactions between chemicals or toxic materials. The hood system is capable of adjustment to vary exhaust air in proportion to the hood face opening by either changing the speed of the exhaust fan (motor speed controller or belt drive pulley) or by adjusting a duct damper setting.
- Drain trough
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A special configured laboratory counter having a drain basin, typically along the back, for discharging non-hazardous liquids involved in laboratory experiments.
- Fume hood
A box-like structure enclosing a source of potential air contamination with an opening in the front into which air enters to exhaust air contaminants at the rear.
- Microscale
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A usable amount of something reduced in size, item by item.
- Pyrophoric
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Capable of spontaneously igniting in air.
- Reagent shelving
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Shelving used to store chemicals having hazard classification of 2-3-4.
- Set-back
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A reduced energy setting typically used when areas are unoccupied.
- Special purpose
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A hood system of atypical design for special operations and/or apparatus.
- Test and Balance
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A adjustment procedure to HVAC systems and fume hoods that sets parameters to design specifications for building or area air supply and exhaust.
- Variable air volume (VAV) system
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A laboratory fume hood air control system that varies the exhaust air volume in proportion to the hood face opening by either changing the speed of the exhaust fan or adjusting an exhaust duct damper.
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