The Exhaust,flue, cataloged under National Stock Number 4520-00-497-6668, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4520-00-497-6668 |
| Item Name | Exhaust,flue |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| General Characteristics Item Description | GALVANIZED STEEL,28 GAGE 7 IN. ID,51-1/2 IN. LONG CORRUGATED PAPER COVER 5/16 IN. THK,7-5/8 IN. OD,49-1/8 IN. LG IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 39-472 | C/1 Advisory reference — outside the item-of-supply concept Aqua-Chem, Inc. Dba Aqua-Chem Inc |
| 39-472 | 3/9 Design control — primary reference Aqua-Chem Inc Cleaver-Brooks Div |
NSN 4520-00-497-6668 is a Exhaust,flue, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-00-695-1029, 5915-01-244-6619. Verify interchangeability with system specifications before substitution.
Key specifications for 4520-00-497-6668: General Characteristics Item Description: GALVANIZED STEEL,28 GAGE 7 IN. ID,51-1/2 IN. LONG CORRUGATED PAPER COVER 5/16 IN. THK,7-5/8 IN. OD,49-1/8 IN. LG IN. 1 specification is 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.