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IAQ Glossary U


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UNITARY SYSTEM: A room unit which performs part or all of the air conditioning functions. It may or may not be used with a central fan system.

UPPER EXPLOSIVE LIMIT (UEL): The highest concentration (expressed in percent vapor or gas in the air by volume) of a substance that will burn or explode when an ignition source is present.

UREA FORMALDEHYDE FROM INSULATION (UFFI): a form of insulation no longer in use because of excessive formaldehyde emissions and documented associated health impacts.

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