The Duct,air,outer, cataloged under National Stock Number 4520-01-166-3545, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-166-3545 |
| Item Name | Duct,air,outer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| FSC Application Data | USE ON HEATER,DUCT-TYPE M-68,VBM-250,NSN 4520-00-001-7726 |
| General Characteristics Item Description | MATERIAL STEEL,ASTM A569;O/A LG 8.937 IN.;O/A H 5.960 IN.;O/A W 2.750 IN.;W/FOUR (4) MTD HOLES 0.155 IN. DIA;TREAT AND PAINT I/A W/MIL-T-704,TY A IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 13219E2462 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4520-01-166-3545 is a Duct,air,outer, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
Key specifications for 4520-01-166-3545: FSC Application Data: USE ON HEATER,DUCT-TYPE M-68,VBM-250,NSN 4520-00-001-7726; General Characteristics Item Description: MATERIAL STEEL,ASTM A569;O/A LG 8.937 IN.;O/A H 5.960 IN.;O/A W 2.750 IN.;W/FOUR (4) MTD HOLES 0.155 IN. DIA;TREAT AND PAINT I/A W/MIL-T-704,TY A IN. 2 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.