PartsTable TECHNICAL DATA SHEET

NSN 4120-01-656-1743Government record, cited

Environmental Control System4120-01-656-1743

NSN 4120-01-656-1743 · NIIN 016561743 · Part number 40MHHQ12---3

Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies · FSC 4120 — Air Conditioning Equipment · FSG 41 — Refrigeration, AC, and Air Circulating Equipment · CAGE 5HSY0

Government record, cited

NSN 4120-01-656-1743 — this item is cataloged by the U.S. Government under National Stock Number 4120-01-656-1743. Manufacturer of record part number: 40MHHQ12---3.

Also searched as 4120-01-656-1743 · 4120016561743 · NIIN 016561743 · 01-656-1743 · FSC 4120 Air Conditioning Equipment · CAGE 5HSY0 · 40MHHQ12---3 · 40MVQ12---3 · 40MVQ12---3

Nearby stock numbers ← 4120-01-656-1741 Environmental Control System · 4120-01-656-4366 Environmental Control System →

Features

Environmental Control System — FSC 4120
1 manufacturer part number on file
Manufacturer of record: Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies

Identification

NSN: 4120-01-656-1743
NIIN: 016561743
FSC: 4120 — Air Conditioning Equipment
FSG: 41 — Refrigeration, AC, and Air Circulating Equipment
Primary part number: 40MHHQ12---3
Manufacturer: Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies

General Description

The Environmental Control System, cataloged under National Stock Number 4120-01-656-1743, is classified within Federal Supply Class 4120 (Air Conditioning Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.

Catalog Facts

Item Name	Environmental Control System
FSC / FSG	4120 — Air Conditioning Equipment (FSG 41)
Manufacturers	Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies (CAGE 5HSY0)

Technical Specifications

Parameter	Value
NSN	4120-01-656-1743
Primary Part Number	40MHHQ12---3
Item Name	Environmental Control System
FSC / FSG	4120 / 41 — Air Conditioning Equipment
Manufacturer	Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies
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
40MHHQ12---3	Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies (USA)

Reference documents

Reference	Meaning
40MVQ12---3	3/9 Design control — primary reference Carrier Corp
40MVQ12---3	5/9 Secondary reference Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies

No interchangeability data on file.

Other items in FSC 4120 — Air Conditioning Equipment

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4120-00-000-0076

4120-00-000-0076 · Item name not on file

4120-00-001-8402

4120-00-001-8402 · Item name not on file

4120-00-001-8403

4120-00-001-8403 · Item name not on file

4120-00-006-6074

4120-00-006-6074 · Item name not on file

4120-00-010-1372

4120-00-010-1372 · Item name not on file

4120-00-011-3383

4120-00-011-3383 · Item name not on file

4120-00-011-3387

4120-00-011-3387 · Item name not on file

4120-00-011-3388

4120-00-011-3388 · Item name not on file

Frequently Asked Questions

What is NSN 4120-01-656-1743?

NSN 4120-01-656-1743 is a Environmental Control System, manufactured by Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies, classified under FSC 4120, Air Conditioning Equipment. Status: active.

What part numbers are listed for NSN 4120-01-656-1743?

NSN 4120-01-656-1743 has 1 manufacturer part number on file: 40MHHQ12---3 (Weathertech Distributing Company Inc Dba Totaline Refrigeration Parts & Supplies).

Is NSN 4120-01-656-1743 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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