The Damper Unit,fire Control, cataloged under National Stock Number 4520-01-289-3645, 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 Specific Systems, Llc Div Specific Systems. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Damper Unit,fire Control |
| FSC / FSG | 4520 — Space and Water Heating Equipment (FSG 45) |
| Manufacturers | Specific Systems, Llc Div Specific Systems (CAGE 0AYP6) |
| Parameter | Value |
|---|---|
| NSN | 4520-01-289-3645 |
| Primary Part Number | DASC11700 |
| Item Name | Damper Unit,fire Control |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Specific Systems, Llc Div Specific Systems |
| Status | ACTIVE |
| 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 |
|---|---|
| T-1464 DASC11700 | Specific Systems, Llc Div Specific Systems (USA) |
| DASC11700 PRIMARY | Specific Systems, Llc Div Specific Systems (USA) |
| Reference | Meaning |
|---|---|
| T-1464-1 | D/9 Drawing number reference only Specific Systems, Llc Div Specific Systems |
| T-1464-2A | D/9 Drawing number reference only Specific Systems, Llc Div Specific Systems |
NSN 4520-01-289-3645 is a Damper Unit,fire Control, manufactured by Specific Systems, Llc Div Specific Systems, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-289-3645 has 2 manufacturer part numbers on file: T-1464 DASC11700 (Specific Systems, Llc Div Specific Systems), DASC11700 (Specific Systems, Llc Div Specific Systems).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-290-7856. Verify interchangeability with system specifications before substitution.
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.