The Respirator,air Filtering, cataloged under National Stock Number 4240-01-250-6522, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-250-6522 |
| Item Name | Respirator,air Filtering |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Mask Filter Quantity | 4 |
| Filter Type | CARTRIDGE AND FILTER PAD |
| Mask Type | FULL FACEPIECE |
| Material Type | ELASTIC |
| Criticality Code Justification | FEAT |
| Visual Provision Type | LENS |
| Adjustability | ADJUSTABLE |
| Exhaust Valve | INCLUDED |
| Head Harness | INCLUDED |
| Filter Replaceability | REPLACEABLE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Reference | Meaning |
|---|---|
| 151-0-00 | 3/9 Design control — primary reference U.S. Government activity |
| U005200000 | 3/2 Design control — primary reference U.S. Government activity |
| 151 | 5/9 Secondary reference U.S. Government activity |
NSN 4240-01-250-6522 is a Respirator,air Filtering, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 5920-01-392-6377, 4730-01-437-4275, 5895-01-463-9463. Verify interchangeability with system specifications before substitution.
Key specifications for 4240-01-250-6522: Mask Filter Quantity: 4; Filter Type: CARTRIDGE AND FILTER PAD; Mask Type: FULL FACEPIECE; Material Type: ELASTIC. 10 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.