The Heat Exchanger,fluid to Air,non-, cataloged under National Stock Number 4520-01-388-5121, 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 Chromalox Inc Dba Chromalox Precision Heat and Control, Inc. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Heat Exchanger,fluid to Air,non- |
| FSC / FSG | 4520 — Space and Water Heating Equipment (FSG 45) |
| Manufacturers | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (CAGE 65586); Chromalox Inc (CAGE 07131) |
| Parameter | Value |
|---|---|
| NSN | 4520-01-388-5121 |
| Primary Part Number | 353-302027-001 |
| Item Name | Heat Exchanger,fluid to Air,non- |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| 353-302027-001 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| 004-302673-003 PIECE 49 | Chromalox Inc (USA) |
| Reference | Meaning |
|---|---|
| 004-302673-003 | D/9 Drawing number reference only Chromalox Inc |
NSN 4520-01-388-5121 is a Heat Exchanger,fluid to Air,non-, manufactured by Chromalox Inc Dba Chromalox Precision Heat and Control, Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-388-5121 has 2 manufacturer part numbers on file: 353-302027-001 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), 004-302673-003 PIECE 49 (Chromalox Inc).
2 possible matches (shared part number, not a government interchangeability claim): 6685-01-389-2068, 6685-01-389-3366. Verify interchangeability with system specifications before substitution.
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.