Damper Air Duct2040-01-643-1222

NSN 2040-01-643-1222 · NIIN 016431222 · Part number MS4120F1204

Greenheck Fan Corporation Dba Greenheck Fan Corp · FSC 2040 — Marine Hardware and Hull Items · FSG 20 — Ship and Marine Equipment · CAGE 51704

Government record, cited

NSN 2040-01-643-1222 — this item is cataloged by the U.S. Government under National Stock Number 2040-01-643-1222. Manufacturer of record part number: MS4120F1204.

Also searched as 2040-01-643-1222 · 2040016431222 · NIIN 016431222 · 01-643-1222 · FSC 2040 Marine Hardware and Hull Items · CAGE 51704 · MS4120F1204 · 2126664 REV -

Nearby stock numbers ← 2040-01-643-0792 Molding, Metal · 2040-01-643-1536 Dog, Door, Marine →

Features

Damper Air Duct — FSC 2040
1 manufacturer part number on file
Manufacturer of record: Greenheck Fan Corporation Dba Greenheck Fan Corp

Identification

NSN: 2040-01-643-1222
NIIN: 016431222
FSC: 2040 — Marine Hardware and Hull Items
FSG: 20 — Ship and Marine Equipment
Primary part number: MS4120F1204
Manufacturer: Greenheck Fan Corporation Dba Greenheck Fan Corp

General Description

The Damper Air Duct, cataloged under National Stock Number 2040-01-643-1222, is classified within Federal Supply Class 2040 (Marine Hardware and Hull Items) of the Ship and Marine Equipment group. The manufacturer of record is Greenheck Fan Corporation Dba Greenheck Fan Corp. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.

Catalog Facts

Item Name	Damper Air Duct
FSC / FSG	2040 — Marine Hardware and Hull Items (FSG 20)
Manufacturers	Greenheck Fan Corporation Dba Greenheck Fan Corp (CAGE 51704)

Technical Specifications

Parameter	Value
NSN	2040-01-643-1222
Primary Part Number	MS4120F1204
Item Name	Damper Air Duct
FSC / FSG	2040 / 20 — Marine Hardware and Hull Items
Manufacturer	Greenheck Fan Corporation Dba Greenheck Fan Corp
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
MS4120F1204 PRIMARY	Greenheck Fan Corporation Dba Greenheck Fan Corp (USA)

Reference documents

Reference	Meaning
2126664 REV -	C/1 Advisory reference — outside the item-of-supply concept Greenheck Fan Corporation Dba Greenheck Fan Corp

Frequently Asked Questions

What is NSN 2040-01-643-1222?

NSN 2040-01-643-1222 is a Damper Air Duct, manufactured by Greenheck Fan Corporation Dba Greenheck Fan Corp, classified under FSC 2040, Marine Hardware and Hull Items. Status: active.

What part numbers are listed for NSN 2040-01-643-1222?

NSN 2040-01-643-1222 has 1 manufacturer part number on file: MS4120F1204 (Greenheck Fan Corporation Dba Greenheck Fan Corp).

Is NSN 2040-01-643-1222 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

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.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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