The Heater,duct Type,stationary, cataloged under National Stock Number 4520-01-331-8612, 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 Indeeco Llc Dba Indeeco. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-331-8612 |
| Primary Part Number | 210-30475-42 ITEM 03-81-4 |
| Item Name | Heater,duct Type,stationary |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Indeeco Llc Dba Indeeco |
| Status | ACTIVE |
| Heat Delivery Rate | 2149.6 BRITISH THERMAL UNIT |
| Phase | THREE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Heat Medium Type | AIR |
| Inclosure Material | STEEL |
| Duct Height | 6.000 INCHES IN |
| Extra Long Reference Number | TFZU-.63-12X6-120/1/1/120-M4N12QU6Z1Z3-1 |
| Voltage in Volts | 120.0 |
| Duct Width | 12.000 INCHES IN |
| Height | 8.000 INCHES NOMINAL IN |
| Depth | 11.000 INCHES NOMINAL IN |
| Width | 19.750 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | DIFFERENTIATED BY EXTRA LONG REFERENCE NUMBER |
| Heating Element Type | ELECTRIC NONIMMERSION |
| Current Rating in Amps | 5.25 |
| 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 |
|---|---|
| 210-30475-42 ITEM 03-81-4 | Indeeco Llc Dba Indeeco (USA) |
| Reference | Meaning |
|---|---|
| TFZU-.63-12X6-120/1/1/120-M4N12- | 3/1 Design control — primary reference Indeeco Llc Dba Indeeco |
| 210-30475-42 | D/9 Drawing number reference only Indeeco Llc Dba Indeeco |
NSN 4520-01-331-8612 is a Heater,duct Type,stationary, manufactured by Indeeco Llc Dba Indeeco, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-331-8612 has 1 manufacturer part number on file: 210-30475-42 ITEM 03-81-4 (Indeeco Llc Dba Indeeco).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-331-8618. Verify interchangeability with system specifications before substitution.
Key specifications for 210-30475-42 ITEM 03-81-4: Heat Delivery Rate: 2149.6 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.