The Heater,duct Type,stationary, cataloged under National Stock Number 4520-01-309-4050, 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 18 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4520-01-309-4050 |
| Primary Part Number | EH21L-A |
| 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 | 2217.8 BRITISH THERMAL UNIT |
| Phase | THREE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Heat Medium Type | AIR |
| Inclosure Material | STEEL |
| Duct Height | 3.250 INCHES IN |
| Voltage in Volts | 440.0 |
| Duct Width | 6.000 INCHES IN |
| Specification/standard Data | 81349-MIL-H-22594 GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | 21 SIZE AND L TYPE |
| Height | 7.750 INCHES NOMINAL IN |
| Surface Treatment | PAINT |
| Depth | 8.000 INCHES NOMINAL IN |
| Width | 13.000 INCHES NOMINAL IN |
| Mounting Type | VENTILATION DUCT |
| Heating Element Type | ELECTRIC NONIMMERSION |
| Current Rating in Amps | 1.48 |
| 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 |
|---|---|
| EH21L-A PRIMARY | Valad Electric Heating Corp. (USA) |
| Reference | Meaning |
|---|---|
| MIL-H-22594 | 4/1 Identification reference U.S. Government activity |
NSN 4520-01-309-4050 is a Heater,duct Type,stationary, manufactured by Valad Electric Heating Corp., classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-309-4050 has 1 manufacturer part number on file: EH21L-A (Valad Electric Heating Corp.).
Key specifications for EH21L-A: Heat Delivery Rate: 2217.8 BRITISH THERMAL UNIT; Phase: THREE; Frequency in Hertz: 60.0; Current Type: AC. 18 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.