The Hose Assembly,air Duct,air Breat, cataloged under National Stock Number 4240-01-309-2201, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-309-2201 |
| Item Name | Hose Assembly,air Duct,air Breat |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Measuring Method and Length | 600.000 INCHES NOMINAL OVERALL IN |
| Criticality Code Justification | FEAT |
| 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 |
|---|---|
| AS10001-50 | 5/9 Secondary reference Racal Health and Safety Inc |
| 526-01-11R01 | 3/9 Design control — primary reference 3m Company |
| 526-01-11R01 | 5/9 Secondary reference 3m Company Div Oh&esd |
| 526-01-11R01 | 5/9 Secondary reference Racal Health and Safety Inc |
| 526-01-11 | 5/9 Secondary reference Racal Health and Safety Inc |
NSN 4240-01-309-2201 is a Hose Assembly,air Duct,air Breat, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5841-01-444-6146. Verify interchangeability with system specifications before substitution.
Key specifications for 4240-01-309-2201: Measuring Method and Length: 600.000 INCHES NOMINAL OVERALL IN; Criticality Code Justification: FEAT; Special Features: SOLE SOURCE REQUIRED BY STATUTE 6.302. 2 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.