Non-Permit Confined Space vs. Permit Required Confined Space
There are very specific definitions that help identify whether or not a confined space requires an entry permit and a pre-entry checklist.
Non-Permit Confined Space
A Non-Permit confined space does not contain or have the potential to contain any hazard capable of causing death or serious physical harm.Examples of non-permit required confined spaces include:
- Interiors of HVAC units
- Certain air plenums and pipe chases
- Attics
- Walk-in freezers or refrigerators
- Some building crawl spaces
Permit Required Confined Space
OSHA uses the term "permit-required confined space" ( or 'permit space') to describe a confined space that:- Contains or has a potential to contain a hazardous atmosphere.
- Contains a material that has the potential for engulfing an entrant.
- Has
an internal configuration such that an entrant could be trapped or
asphyxiated by inwardly converging walls or by a floor which slopes
downward and tapers to a smaller cross-section.
- Contains any other recognized serious safety or health hazard, such as unguarded machinery, exposed live wires, or heat stress.
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