The Damper,flue, cataloged under National Stock Number 4520-01-231-7155, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-231-7155 |
| Primary Part Number | 7250-999 AY99B 7X9IN. |
| Item Name | Damper,flue |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Shape | RECTANGULAR |
| Material | STEEL |
| Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 7250-999 AY99B 7X9IN. PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 7250-999 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 501-5003660 | D/9 Drawing number reference only U.S. Government activity |
| 501-5003660 AY99B | 5/2 Secondary reference U.S. Government activity |
NSN 4520-01-231-7155 is a Damper,flue, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-231-7155 has 1 manufacturer part number on file: 7250-999 AY99B 7X9IN. (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 7250-999 AY99B 7X9IN.: Shape: RECTANGULAR; Overall Length: 7.000 INCHES NOMINAL IN; Overall Width: 9.000 INCHES NOMINAL IN; End Item Identification: CARRIER,AIRCRAFT,NEWPORT NEWS SHIPBUILDING,CVN 70 SERIES. 3 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.