The Unit Heater,air Circulating,stea, cataloged under National Stock Number 4520-00-450-9554, 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 Trane U.s. Inc. Dba the Trane Co Div Trane Headquarters. Government technical data includes 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4520-00-450-9554 |
| Primary Part Number | 146P |
| Item Name | Unit Heater,air Circulating,stea |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Trane U.s. Inc. Dba the Trane Co Div Trane Headquarters |
| Status | ACTIVE |
| Maximum Air Flow Rate | 2440.0 CUBIC FEET PER MINUTE |
| Speed Adjustments | SINGLE SPEED |
| Heat Delivery Rate | 152000.0 BRITISH THERMAL UNIT |
| Phase | SINGLE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Heat Medium Type | HOT WATER |
| Quantity | 1 |
| Voltage in Volts | 115.0 |
| Heat Outlet Quantity | 1 |
| Heat Discharge Outlet Type | STATIONARY |
| Heat Delivery Direction | VERTICAL |
| Height | 13.625 INCHES NOMINAL IN |
| Air Circulation Device | PROPELLER FAN |
| Maximum Pressure Limit | 80.0 POUNDS PER SQUARE INCH GAGE LBS |
| Depth | 29.500 INCHES NOMINAL IN |
| Width | 29.500 INCHES NOMINAL IN |
| Prime Mover Type | ELECTRIC MOTOR |
| Circulated Air Type | HEATED |
| Heat Directing Device | FOUR CONE DIFFUSER |
| Mounting Type | CEILING SUSPENDED |
| Heating Element Type | HOT WATER COIL AND STEAM COIL |
| Current Rating in Amps | 1.5 |
| 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 |
|---|---|
| 146P PRIMARY | Trane U.s. Inc. Dba the Trane Co Div Trane Headquarters (USA) |
| Reference | Meaning |
|---|---|
| 180P | 5/9 Secondary reference Trane U.s. Inc. Dba the Trane Co Div Trane Headquarters |
NSN 4520-00-450-9554 is a Unit Heater,air Circulating,stea, manufactured by Trane U.s. Inc. Dba the Trane Co Div Trane Headquarters, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-00-450-9554 has 1 manufacturer part number on file: 146P (Trane U.s. Inc. Dba the Trane Co Div Trane Headquarters).
2 possible matches (shared part number, not a government interchangeability claim): 5310-00-807-4338, 4010-01-470-6534. Verify interchangeability with system specifications before substitution.
Key specifications for 146P: Maximum Air Flow Rate: 2440.0 CUBIC FEET PER MINUTE; Speed Adjustments: SINGLE SPEED; Heat Delivery Rate: 152000.0 BRITISH THERMAL UNIT; Phase: SINGLE. 23 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.