Fits these systems

Systems this part fits, with compatibility status and evidence
System	Compatibility status	Evidence
Miller Miller PAPR II (Gen 2)	T1 Officially approved	[01] www.millerwelds.com manufacturer manual Miller owner's manual OM-OTC-287373 Rev D (2024-07), "Powered Air-Purifying Respirator (PAPR) Blower Units," Section 4 "NIOSH Approval, Cautions, and Limitations" (p.12): "The Miller PAPR2 Powered Air Purifying Respirator Blower Assembly is one component of a NIOSH approved respiratory system... manufactured by OTOS Tech. Co. Ltd. for Miller Electric Mfg. LLC under NIOSH approval numbers TC21C-1239, TC21C-1342, TC21C-1345, and TC21C-1198." Blower assembly itself listed as item 1, part 287172, in Section 8 "Parts List," Figure 8-1 "Powered Air Purifying Respirator (PAPR) Gen 2 Blower Assembly" (p.26). Archived in repo at sources/miller-o287373d_mil.pdf. 2026-07-06

Specifications

Technical specifications
Size	8.25 x 7 x 3.25 in. (210 x 178 x 76 mm)
Weight (assembly w/ filters, belt, shoulder straps, and battery)	48 oz. (1362 g)
Air flow	Low: 6.18+ CFM (175+ LPM); Medium: 6.89 CFM (195 LPM); High: 7.59 CFM (215 LPM)
Operating temperature	23° to 131°F (-5° to 55°C)
Storage temperature	14° to 176°F (-10° to 80°C)
Battery type	Rechargeable lithium (287178), ~3 h charge time, 500-charge rated life
NIOSH approval numbers	TC-21C-1239, TC-21C-1342, TC-21C-1345, TC-21C-1198 (blower + T94iH-R/T94i-R/T94i-R XL/T94-R/Face Shield hood combinations), manufactured by OTOS Tech Co. Ltd. for Miller Electric Mfg. LLC

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Listing ≠ endorsement. Confirm availability, approval status and source evidence before purchase or regulated workplace use.

Notes

This manual (OM-OTC-287373 Rev D, 2024-07) is scoped entirely to the "Gen 2 PAPR" blower — every operating-instructions figure is explicitly labelled "Gen 2 PAPR." It does not contain a Gen-1 parts section, so no Gen-1 fitment rows are added from this source. The manual's troubleshooting table (Section 7, p.25) does cross-reference Gen 1: "Use charger 244132 for battery 244131. Use charger 282077 for battery 282076 and battery 287178" — useful confirmation that the 282077 charger serves two battery part numbers (287178 already on file; 282076 not yet a record).

Record sources

Evidence — dated sources

[01] www.millerwelds.com manufacturer manual OM-OTC-287373 Rev D (2024-07), Section 4 (p.12), Section 5-1 Respirator Specifications (p.13), and Section 8 Parts List Figure 8-1 (p.26). Archived at sources/miller-o287373d_mil.pdf. 2026-07-06