The Heater,duct Type,stationary, cataloged under National Stock Number 4520-01-259-2193, 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 14 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-259-2193 |
| Primary Part Number | TFZ-37H |
| 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 | 511800.0 BRITISH THERMAL UNIT |
| Phase | THREE |
| Frequency in Hertz | 60.0 |
| Current Type | AC |
| Heat Medium Type | AIR |
| Voltage in Volts | 440.0 |
| Specification/standard Data | 81349-MIL-H-22594 GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | H TYPE AND 37EH SIZE |
| Height | 39.125 INCHES NOMINAL IN |
| Depth | 8.000 INCHES NOMINAL IN |
| Width | 52.000 INCHES NOMINAL IN |
| Mounting Type | VENTILATION DUCT |
| Heating Element Type | ELECTRIC NONIMMERSION |
| Current Rating in Amps | 3.4 |
| 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 |
|---|---|
| TFZ-37H PRIMARY | Indeeco Llc Dba Indeeco (USA) |
| EH37-H PRIMARY | Valad Electric Heating Corp. (USA) |
| 106-056816-054 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| Reference | Meaning |
|---|---|
| 106-056816-000 | D/9 Drawing number reference only Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| MIL-H-22594 | 4/1 Identification reference U.S. Government activity |
NSN 4520-01-259-2193 is a Heater,duct Type,stationary, manufactured by Indeeco Llc Dba Indeeco, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-259-2193 has 3 manufacturer part numbers on file: TFZ-37H (Indeeco Llc Dba Indeeco), EH37-H (Valad Electric Heating Corp.), 106-056816-054 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
Key specifications for TFZ-37H: Heat Delivery Rate: 511800.0 BRITISH THERMAL UNIT; Phase: THREE; Frequency in Hertz: 60.0; Current Type: AC. 14 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.