The Damper,flue, cataloged under National Stock Number 4520-01-563-5987, 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 Naval Sea Systems Command. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-563-5987 |
| Primary Part Number | 501-8336655 ITEM 2 |
| Item Name | Damper,flue |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Mounting Method | INSERTED CENTER SHAFT |
| Shape | RECTANGULAR |
| Material | ALUMINUM |
| 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 |
|---|---|
| 700-PDR40-6X25 | Fl Centek Industries Inc Dba Delta T Systems (USA) |
| 501-8336655 ITEM 2 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 700-PDR40-6X25 | 5/9 Secondary reference Fl Centek Industries Inc Dba Delta T Systems |
NSN 4520-01-563-5987 is a Damper,flue, manufactured by Naval Sea Systems Command, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-563-5987 has 2 manufacturer part numbers on file: 700-PDR40-6X25 (Fl Centek Industries Inc Dba Delta T Systems), 501-8336655 ITEM 2 (Naval Sea Systems Command).
Key specifications for 501-8336655 ITEM 2: Overall Height: 25.000 INCHES NOMINAL IN; Mounting Method: INSERTED CENTER SHAFT; Shape: RECTANGULAR; Overall Width: 8.000 INCHES NOMINAL IN. 4 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.