The Unit Heater,air Circulating,stea, cataloged under National Stock Number 4520-01-274-4708, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 27 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4520-01-274-4708 |
| Item Name | Unit Heater,air Circulating,stea |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| Maximum Air Flow Rate | 500.0 CUBIC FEET PER MINUTE |
| Speed Adjustments | SINGLE SPEED |
| Heat Delivery Rate | 30000.0 BRITISH THERMAL UNIT |
| Phase | SINGLE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Surface Treatment Document and Classification | TT-P-664 FED SPEC SINGLE TREATMENT RESPONSE |
| Heat Medium Type | HOT WATER OR STEAM |
| Inclosure Material | STEEL |
| Quantity | 1 |
| Voltage in Volts | 230.0 |
| Heat Outlet Quantity | 1 |
| Specification/standard Data | 81349-MIL-U-17293D/SH/ GOVERNMENT SPECIFICATION |
| Heat Discharge Outlet Type | ADJUSTABLE |
| Heat Delivery Direction | HORIZONTAL |
| Height | 18.750 INCHES NOMINAL IN |
| Air Circulation Device | PROPELLER FAN |
| Surface Treatment | PRIMER |
| Maximum Pressure Limit | 25.0 POUNDS PER SQUARE INCH GAGE LBS |
| Depth | 27.000 INCHES NOMINAL IN |
| Width | 22.000 INCHES NOMINAL IN |
| Prime Mover Type | ELECTRIC MOTOR |
| Circulated Air Type | HEATED |
| Heat Directing Device | ADJUSTABLE LOUVER |
| Mounting Type | CEILING SUSPENDED |
| Heating Element Type | HOT WATER COIL OR STEAM COIL |
| Current Rating in Amps | 0.41 |
| 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 |
|---|---|
| 82DOK-SZ12 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 82D35 | D/9 Drawing number reference only U.S. Government activity |
| 82D35-SZ12 | 5/9 Secondary reference U.S. Government activity |
| 82D35 SIZE 12 230 VOLT | 3/2 Design control — primary reference U.S. Government activity |
| 82D35 SZ 12 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| MIL-U-17293 | 4/1 Identification reference U.S. Government activity |
NSN 4520-01-274-4708 is a Unit Heater,air Circulating,stea, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4520-01-340-2190, 4520-01-353-1382. Verify interchangeability with system specifications before substitution.
Key specifications for 4520-01-274-4708: Maximum Air Flow Rate: 500.0 CUBIC FEET PER MINUTE; Speed Adjustments: SINGLE SPEED; Heat Delivery Rate: 30000.0 BRITISH THERMAL UNIT; Phase: SINGLE. 27 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.