The Heater,space, cataloged under National Stock Number 4520-01-329-3451, 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 International Thermal Research Ltd Dba Itr. Government technical data includes 12 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4520-01-329-3451 |
| Primary Part Number | 5-13-4400 |
| Item Name | Heater,space |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | International Thermal Research Ltd Dba Itr |
| Status | CANCELLED |
| Heat Delivery Rate | 45000.0 BRITISH THERMAL UNIT |
| Inclosure Material | STEEL CORROSION RESISTING |
| Special Test Features | JP8 JET FUEL IS ALSO USED BY THIS ITEM |
| Diameter | 18.000 INCHES NOMINAL IN |
| Fuel Type | DF-A ARCTIC DIESEL FUEL OIL OR DF-1 WINTER DIESEL FUEL OIL OR DF-2 REGULAR DIESEL FUEL OIL OR JP-5 JET FUEL |
| Height | 24.000 INCHES NOMINAL IN |
| Circulated Air Type | HEATED |
| Ignition Method | MANUAL |
| Mounting Type | FLOOR SURFACE, FREE STANDING, NONDUCTED |
| Fuel Feed Method | GRAVITY |
| Heating Element Type | BURNER |
| Operating Control Type | HAND SWITCH |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 5-13-4400 | International Thermal Research Ltd Dba Itr (CAN) |
| Reference | Meaning |
|---|---|
| 45000 | 5/9 Secondary reference U.S. Government activity |
| 5-13-4400 | 3/2 Design control — primary reference U.S. Government activity |
| 5-13-4400 | 5/9 Secondary reference Ran-Paige Co Inc the Dba M C General Inc |
NSN 4520-01-329-3451 is a Heater,space, manufactured by International Thermal Research Ltd Dba Itr, classified under FSC 4520, Space and Water Heating Equipment. Status: cancelled.
NSN 4520-01-329-3451 has 1 manufacturer part number on file: 5-13-4400 (International Thermal Research Ltd Dba Itr).
1 possible match (shared part number, not a government interchangeability claim): 4310-01-728-9477. Verify interchangeability with system specifications before substitution.
Key specifications for 5-13-4400: Heat Delivery Rate: 45000.0 BRITISH THERMAL UNIT; Inclosure Material: STEEL CORROSION RESISTING; Special Test Features: JP8 JET FUEL IS ALSO USED BY THIS ITEM; Diameter: 18.000 INCHES NOMINAL IN. 12 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.
NSN 4520-01-329-3451 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.