The Heater,duct Type,stationary, cataloged under National Stock Number 4520-01-531-9623, 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 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-531-9623 |
| Primary Part Number | TFZ-37H-2S |
| Item Name | Heater,duct Type,stationary |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Indeeco Llc Dba Indeeco |
| Status | ACTIVE |
| Inclosure Material | STEEL CORROSION RESISTING |
| Duct Height | 39.250 INCHES IN |
| Heat Outlet Quantity | 2 |
| Duct Width | 8.000 INCHES IN |
| Heat Discharge Outlet Type | STATIONARY |
| Heat Delivery Direction | HORIZONTAL |
| Height | 39.250 INCHES NOMINAL IN |
| Width | 7.969 INCHES MINIMUM AND 8.031 INCHES MAXIMUM IN |
| Outlet Position | 180 DEG APART |
| Heating Element Type | ELECTRIC NONIMMERSION |
| 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-2S PRIMARY | Indeeco Llc Dba Indeeco (USA) |
| Reference | Meaning |
|---|---|
| L210N1:E21412-D REV 0 | 5/1 Secondary reference Indeeco Llc Dba Indeeco |
NSN 4520-01-531-9623 is a Heater,duct Type,stationary, manufactured by Indeeco Llc Dba Indeeco, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-531-9623 has 1 manufacturer part number on file: TFZ-37H-2S (Indeeco Llc Dba Indeeco).
Key specifications for TFZ-37H-2S: Inclosure Material: STEEL CORROSION RESISTING; Duct Height: 39.250 INCHES IN; Heat Outlet Quantity: 2; Duct Width: 8.000 INCHES IN. 10 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.