The Impeller,fan,centrifugal, cataloged under National Stock Number 4140-01-254-1649, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4140-01-254-1649 |
| Item Name | Impeller,fan,centrifugal |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Status | ACTIVE |
| Attachment Method | SETSCREW |
| Diameter | 17.000 INCHES NOMINAL IN |
| Blade Quantity | 12 |
| Width | 1.210 INCHES NOMINAL IN |
| Material | ALUMINUM OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 74156-1 | 3/9 Design control — primary reference U.S. Government activity |
| 74156-1 | 5/9 Secondary reference Drs Environmental Systems Inc |
| 74156-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4140-01-254-1649 is a Impeller,fan,centrifugal, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5962-01-365-6718, 5310-01-400-0993. Verify interchangeability with system specifications before substitution.
Key specifications for 4140-01-254-1649: Attachment Method: SETSCREW; Diameter: 17.000 INCHES NOMINAL IN; Blade Quantity: 12; Width: 1.210 INCHES NOMINAL IN. 5 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.