The Filter,particulate, cataloged under National Stock Number 4240-01-644-5966, 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 Filtration Group Llc Div Filterwerks. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-644-5966 |
| Primary Part Number | 42670L |
| Item Name | Filter,particulate |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Filtration Group Llc Div Filterwerks |
| Status | ACTIVE |
| Filtration Rate | 327.00 CUBIC FEET PER MINUTE NOMINAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 42670L | Filtration Group Llc Div Filterwerks (USA) |
| 3061397-005 | American Air Filter (USA) |
| Reference | Meaning |
|---|---|
| 3707900 REV Q | D/9 Drawing number reference only U.S. Government activity |
| 3707901 | 3/2 Design control — primary reference U.S. Government activity |
| APPENDIX A ITEM 32B | 5/2 Secondary reference U.S. Government activity |
NSN 4240-01-644-5966 is a Filter,particulate, manufactured by Filtration Group Llc Div Filterwerks, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-644-5966 has 2 manufacturer part numbers on file: 42670L (Filtration Group Llc Div Filterwerks), 3061397-005 (American Air Filter).
Key specifications for 42670L: Overall Height: 18.00 INCHES NOMINAL IN; Overall Length: 30.00 INCHES NOMINAL IN; Overall Width: 3.10 INCHES NOMINAL IN; Special Features: STATIC PRESSURE DIFFERENTIAL IS 0.6. 1 specification is 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.