The Fan,ventilating, cataloged under National Stock Number 4140-01-539-8629, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Ems Development Corporation. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-539-8629 |
| Primary Part Number | 478D8022-1 |
| Item Name | Fan,ventilating |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Ems Development Corporation |
| Status | ACTIVE |
| Rotation Direction for Which Designed | COUNTERCLOCKWISE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 478D8022-1 PRIMARY | Ems Development Corporation (USA) |
| Reference | Meaning |
|---|---|
| 478D0100 | D/9 Drawing number reference only Ems Development Corporation |
NSN 4140-01-539-8629 is a Fan,ventilating, manufactured by Ems Development Corporation, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-539-8629 has 1 manufacturer part number on file: 478D8022-1 (Ems Development Corporation).
Key specifications for 478D8022-1: Special Features: ITEM SIZE IS 4.000 INCHES IN; Part Name Assigned by Controlling Agency: 4 IN BLOWER IN; End Item Identification: DEGAUSSING CONTROL UNIT ASSEMBLY; Rotation Direction for Which Designed: COUNTERCLOCKWISE. 1 specification is 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.