The Filter Element,air Conditioning, cataloged under National Stock Number 4130-00-278-9558, is classified within Federal Supply Class 4130 (Refrigeration and Air Conditioning Components) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Falls Filtration Technologies, Inc.. Government technical data includes 9 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. 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 | 4130-00-278-9558 |
| Primary Part Number | 121991 |
| Item Name | Filter Element,air Conditioning |
| FSC / FSG | 4130 / 41 — Refrigeration and Air Conditioning Components |
| Manufacturer | Falls Filtration Technologies, Inc. |
| Status | ACTIVE |
| Maximum Air Flow Rate | 360.0 CUBIC FEET PER MINUTE |
| Filtering Media Design | SPIRAL WOUND SECOND FILTERING MEDIA RESPONSE |
| Filtering Media Design | SPUN ROVING FIRST FILTERING MEDIA RESPONSE |
| Body Overall Length | 20.440 INCHES MINIMUM AND 20.500 INCHES MAXIMUM IN |
| Design Type | REUSABLE |
| Style Designator | RECTANGULAR (INCL SQUARE) |
| Material | ALUMINUM FILTERING MEDIUM |
| Material | METAL FRAME |
| Body Thickness | 0.750 INCHES NOMINAL IN |
| 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 |
|---|---|
| 121991 PRIMARY | Falls Filtration Technologies, Inc. (USA) |
NSN 4130-00-278-9558 is a Filter Element,air Conditioning, manufactured by Falls Filtration Technologies, Inc., classified under FSC 4130, Refrigeration and Air Conditioning Components. Status: active.
NSN 4130-00-278-9558 has 1 manufacturer part number on file: 121991 (Falls Filtration Technologies, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-062-3578. Verify interchangeability with system specifications before substitution.
Key specifications for 121991: Maximum Air Flow Rate: 360.0 CUBIC FEET PER MINUTE; Filtering Media Design: SPIRAL WOUND SECOND FILTERING MEDIA RESPONSE; Filtering Media Design: SPUN ROVING FIRST FILTERING MEDIA RESPONSE; Body Overall Length: 20.440 INCHES MINIMUM AND 20.500 INCHES MAXIMUM IN. 9 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.