The Damper,flue, cataloged under National Stock Number 4520-01-322-5810, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4520-01-322-5810 |
| Item Name | Damper,flue |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| Mounting Method | AFFIXED END BEARING SHAFT |
| Overall Thickness | 6.000 INCHES NOMINAL IN |
| Shape | RECTANGULAR |
| Surface Treatment | ZINC |
| Positioning Holder Type | QUADRANT |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| DAA-P-2341 | 5/9 Secondary reference Mestek, Inc. Dba American Warming & Ventilating Division Div American Warming and Ventilating |
| P-2341 37X33IN | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| P-2341 37WX33H IN. | 3/9 Design control — primary reference Mestek, Inc. Dba American Warming & Ventilating Division Div American Warming and Ventilating |
NSN 4520-01-322-5810 is a Damper,flue, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 4520-01-322-5811, 4520-01-322-5813, 4520-01-322-5814. Verify interchangeability with system specifications before substitution.
Key specifications for 4520-01-322-5810: Overall Height: 33.000 INCHES NOMINAL IN; Mounting Method: AFFIXED END BEARING SHAFT; Overall Thickness: 6.000 INCHES NOMINAL IN; Shape: RECTANGULAR. 6 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.