The Unit Heater,air Circulating,stea, cataloged under National Stock Number 4520-01-389-0443, 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 Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4520-01-389-0443 |
| Primary Part Number | 43-506-002 |
| Item Name | Unit Heater,air Circulating,stea |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil |
| Status | ACTIVE |
| Heat Delivery Rate | 6824.0 BRITISH THERMAL UNIT |
| Radio Interference Suppression Type | ANY ACCEPTABLE |
| Phase | THREE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Heat Medium Type | HOT WATER |
| Inclosure Material | STEEL |
| Voltage in Volts | 440.0 |
| Heat Outlet Quantity | 2 |
| Heat Discharge Outlet Type | ADJUSTABLE |
| Heat Delivery Direction | HORIZONTAL |
| Height | 15.000 INCHES NOMINAL IN |
| Depth | 26.250 INCHES NOMINAL IN |
| Width | 13.375 INCHES NOMINAL IN |
| Heat Directing Device | FIXED LOUVER |
| Outlet Position | 90 DEG APART |
| Heating Element Type | ELECTRIC NONIMMERSION |
| Current Rating in Amps | 2.624 |
| 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 |
|---|---|
| 43-506-002 PRIMARY | Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil (USA) |
| 89D0128 | Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil (USA) |
| Reference | Meaning |
|---|---|
| 89D0128 SZ 11 2KW | C/1 Advisory reference — outside the item-of-supply concept Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil |
NSN 4520-01-389-0443 is a Unit Heater,air Circulating,stea, manufactured by Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-389-0443 has 2 manufacturer part numbers on file: 43-506-002 (Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil), 89D0128 (Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil).
2 possible matches (shared part number, not a government interchangeability claim): 5980-01-481-4597, 4520-01-592-3136. Verify interchangeability with system specifications before substitution.
Key specifications for 43-506-002: Heat Delivery Rate: 6824.0 BRITISH THERMAL UNIT; Radio Interference Suppression Type: ANY ACCEPTABLE; Phase: THREE; Frequency in Hertz: 60.0. 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.