The Positive Pressure Unit, cataloged under National Stock Number 4540-01-437-4226, is classified within Federal Supply Class 4540 (Waste Disposal Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc. Government technical data includes 2 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4540-01-437-4226 |
| Primary Part Number | BB100NNS26 |
| Item Name | Positive Pressure Unit |
| FSC / FSG | 4540 / 45 — Waste Disposal Equipment |
| Manufacturer | Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc |
| Status | ACTIVE |
| General Characteristics Item Description | PROVIDES TEMPORARY POWER TO THE SSMG SPACE HEATERS |
| Material | PLASTIC |
| 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 |
|---|---|
| 307-7063788 SHEET 5 ITEM 1 | Naval Sea Systems Command (USA) |
| BB100NNS26 PRIMARY | Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc (USA) |
| Reference | Meaning |
|---|---|
| 307-7063788 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4540-01-437-4226 is a Positive Pressure Unit, manufactured by Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc, classified under FSC 4540, Waste Disposal Equipment. Status: active.
NSN 4540-01-437-4226 has 2 manufacturer part numbers on file: 307-7063788 SHEET 5 ITEM 1 (Naval Sea Systems Command), BB100NNS26 (Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc).
4 possible matches (shared part number, not a government interchangeability claim): 6680-01-457-9002, 4820-01-458-0400, 4940-01-463-8561. Verify interchangeability with system specifications before substitution.
Key specifications for BB100NNS26: Overall Height: 9.000 INCHES NOMINAL IN; General Characteristics Item Description: PROVIDES TEMPORARY POWER TO THE SSMG SPACE HEATERS; Overall Length: 23.250 INCHES NOMINAL IN; Overall Width: 20.750 INCHES NOMINAL IN. 2 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.