Powered Air-Purifying Respirator (PAPR) · Helmet/hood · 29 CFR 1910.134
For Powered Air-Purifying Respirator (PAPR), facepiece is Helmet/hood; jurisdiction is 29 CFR 1910.134; assigned protection factor is 25/1,000, recorded from its source on 2026-09-24.
- Respirator type
- Powered Air-Purifying Respirator (PAPR) verified
- Facepiece
- Helmet/hood our reading
- Assigned protection factor
- 25/1,000 verified
- Jurisdiction
- 29 CFR 1910.134 our reading
- Conditions
- The employer must have evidence provided by the respirator manufacturer that testing of these respirators demonstrates performance at a level of protection of 1,000 or greater to receive an APF of 1,000. This level of performance can best be demonstrated by performing a WPF or SWPF study or equivalent testing. Absent such testing, all other PAPRs and SARs with helmets/hoods are to be treated as loose-fitting facepiece respirators, and receive an APF of 25. verified
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
Assigned protection factor
The source prints this value inside the passage below but does not name it there. The passage shows where it appears; what ties it to this record is the position on the page, not anything the passage says.
2. Powered Air-Purifying Respirator (PAPR) | | 50 | 1,000 | 4 25/1,000 | 25
— ecfr.gov, retrieved 2026-09-24
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
Conditions
The employer must have evidence provided by the respirator manufacturer that testing of these respirators demonstrates performance at a level of protection of 1,000 or greater to receive an APF of 1,000. This level of performance can best be demonstrated by performing a WPF or SWPF study or equivalent testing. Absent such testing, all other PAPRs and SARs with helmets/hoods are to be treated as loose-fitting facepiece respirators, and receive an APF of 25.
— all from ecfr.gov, retrieved 2026-09-24
Source
- ecfr.govhttps://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-I/section-1910.134