The Respirator,air Filtering, cataloged under National Stock Number 4240-01-343-7522, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4240-01-343-7522 |
| Item Name | Respirator,air Filtering |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Mask Type | FULL FACEPIECE |
| Criticality Code Justification | FEAT |
| Material | RUBBER SILICONE CLASS Q MASK |
| 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 |
|---|---|
| S7400 | 5/9 Secondary reference Aearo Company 1 Dba Aearo Div Ao Safety Occupational Prescription Eyewear |
| S7400 | 3/9 Design control — primary reference U.S. Government activity |
| S7400 | 5/9 Secondary reference 3m Company |
NSN 4240-01-343-7522 is a Respirator,air Filtering, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5985-01-608-1876, 1670-01-610-5284. Verify interchangeability with system specifications before substitution.
Key specifications for 4240-01-343-7522: Mask Type: FULL FACEPIECE; Criticality Code Justification: FEAT; Special Features: SOLE SOURCE REQUIRED BY STATUTE 6.302; Material: RUBBER SILICONE CLASS Q MASK. 3 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.