TL;DR
A negative air machine is a ducted HEPA filtration unit that exhausts air out of a sealed work area, keeping the containment at lower pressure than surrounding rooms so contaminated air cannot escape. It is required equipment in mold remediation, asbestos and lead abatement, and fire cleanup, with manometers verifying the pressure differential.
What it means
A negative air machine is a ducted HEPA filtration unit that exhausts air out of a sealed work area, keeping the containment at lower pressure than surrounding rooms so contaminated air cannot escape. It is required equipment in mold remediation, asbestos and lead abatement, and fire cleanup, with manometers verifying the pressure differential. Capacity is sized to exchange the contained volume several times per hour, and the same chassis recirculating indoors is called an air scrubber.
Where it sits in the glossary
Negative air machine is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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