The Heater,duct Type,stationary, cataloged under National Stock Number 4520-01-339-7771, 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 Valad Electric Heating Corp.. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-339-7771 |
| Primary Part Number | VDHR6X4-1(40.5-1)-2 |
| Item Name | Heater,duct Type,stationary |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Valad Electric Heating Corp. |
| Status | ACTIVE |
| Heat Delivery Rate | 1711.5 BRITISH THERMAL UNIT |
| Phase | SINGLE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Heat Medium Type | AIR |
| Inclosure Material | STEEL CORROSION RESISTING |
| Duct Height | 11.000 INCHES IN |
| Voltage in Volts | 440.0 |
| Duct Width | 11.500 INCHES IN |
| Height | 6.000 INCHES NOMINAL IN |
| Depth | 5.750 INCHES NOMINAL IN |
| Width | 4.000 INCHES NOMINAL IN |
| Mounting Type | VENTILATION DUCT |
| Heating Element Type | ELECTRIC NONIMMERSION |
| Current Rating in Amps | 1.1 |
| Operating Control Type | THERMOSTATIC |
| 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 |
|---|---|
| 88-0101 | Valad Electric Heating Corp. (USA) |
| VDHR6X4-1(40.5-1)-2 PRIMARY | Valad Electric Heating Corp. (USA) |
| Reference | Meaning |
|---|---|
| VDHR 6X4-1(40.5 -1)-2 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 4520-01-339-7771 is a Heater,duct Type,stationary, manufactured by Valad Electric Heating Corp., classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-339-7771 has 2 manufacturer part numbers on file: 88-0101 (Valad Electric Heating Corp.), VDHR6X4-1(40.5-1)-2 (Valad Electric Heating Corp.).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-340-1154. Verify interchangeability with system specifications before substitution.
Key specifications for VDHR6X4-1(40.5-1)-2: Heat Delivery Rate: 1711.5 BRITISH THERMAL UNIT; Phase: SINGLE; Frequency in Hertz: 60.0; Current Type: AC. 16 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.