The Heater,duct Type,stationary, cataloged under National Stock Number 4520-01-200-0680, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-200-0680 |
| Item Name | Heater,duct Type,stationary |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| Heat Delivery Rate | 31595.1 BRITISH THERMAL UNIT |
| Phase | THREE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Heat Medium Type | AIR |
| Inclosure Material | STEEL OR STEEL CORROSION RESISTING |
| Voltage in Volts | 440.0 |
| Specification/standard Data | 81349-MIL-PRF-22594 GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | L SIZE AND 28EH TYPE |
| Height | 12.250 INCHES NOMINAL IN |
| Surface Treatment | ZINC |
| Depth | 8.000 INCHES NOMINAL IN |
| Width | 38.000 INCHES NOMINAL IN |
| Mounting Type | VENTILATION DUCT |
| Heating Element Type | ELECTRIC NONIMMERSION |
| Current Rating in Amps | 21.0 |
| 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 |
|---|---|
| 210-18958-41 | C/1 Advisory reference — outside the item-of-supply concept Indeeco Llc Dba Indeeco |
| TFZ2BL | C/1 Advisory reference — outside the item-of-supply concept Indeeco Llc Dba Indeeco |
| EH28L | 5/1 Secondary reference Valad Electric Heating Corp. |
| 106-056816-025 | 5/1 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| 106-056816-000 | D/9 Drawing number reference only Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| M22594-28L | 2/2 Government specification standardization U.S. Government activity |
| MIL-H-22594 | 5/9 Secondary reference U.S. Government activity |
| MIL-PRF-22594 | 4/1 Identification reference U.S. Government activity |
| TFZ-28L | 5/1 Secondary reference Indeeco Llc Dba Indeeco |
NSN 4520-01-200-0680 is a Heater,duct Type,stationary, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
Key specifications for 4520-01-200-0680: Heat Delivery Rate: 31595.1 BRITISH THERMAL UNIT; Phase: THREE; 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.