The Respirator,air Filtering, cataloged under National Stock Number 4240-01-249-2546, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Mine Safety Appliances Company. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-249-2546 |
| Primary Part Number | 466255 |
| Item Name | Respirator,air Filtering |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Mask Filter Quantity | 2 |
| Filter Type | CARTRIDGE AND FILTER PAD |
| Mask Type | HALF FACEPIECE |
| Material Type | ELASTIC |
| Criticality Code Justification | FEAT |
| Approval Designator | ERR-060 |
| Adjustability | ADJUSTABLE |
| Exhaust Valve | INCLUDED |
| Head Harness | INCLUDED |
| Strap Type | FOUR PIECE |
| Filter Replaceability | REPLACEABLE |
| Material | RUBBER MASK |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 466255 PRIMARY | Mine Safety Appliances Company (USA) |
NSN 4240-01-249-2546 is a Respirator,air Filtering, manufactured by Mine Safety Appliances Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-249-2546 has 1 manufacturer part number on file: 466255 (Mine Safety Appliances Company).
Key specifications for 466255: Mask Filter Quantity: 2; Filter Type: CARTRIDGE AND FILTER PAD; Mask Type: HALF FACEPIECE; Material Type: ELASTIC. 12 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.