The Air Flow Indicator Kit, cataloged under National Stock Number 6640-01-272-4529, is classified within Federal Supply Class 6640 (Laboratory Equipment and Supplies) of the Instruments and Laboratory Equipment group. The manufacturer of record is Major Safety Service, Inc. Dba Major Safety Service Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6640-01-272-4529 |
| Primary Part Number | CH 25301 |
| Item Name | Air Flow Indicator Kit |
| FSC / FSG | 6640 / 66 — Laboratory Equipment and Supplies |
| Manufacturer | Major Safety Service, Inc. Dba Major Safety Service Inc |
| Status | ACTIVE |
| General Characteristics Item Description | DESIGNED FOR VISUAL DETERMINATION OFF DIRECTIONAL PATTERN OF AIR CURRENTS AROUND AIR DUCTS,VENTILLATING/HEATING SYSTEMS AND LAB HOODS; C/O 6 SMOKE TUBES ALLOWING 100 TESTS EACH,ASSPIRATOR BULB,TUBE-TIP BREAKER AND OPTIONAL CARRYING CASE; TUBES PROVIDE A VISIBLE WHITE SMOKE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| CH 25301 | Major Safety Service, Inc. Dba Major Safety Service Inc (USA) |
| Reference | Meaning |
|---|---|
| CH 25301 | 3/9 Design control — primary reference Draeger Safety, Inc. |
| 88-1-22-05 | 5/1 Secondary reference Air Force Medical Logistics Office |
| CH 25301 | C/1 Advisory reference — outside the item-of-supply concept Draeger Inc |
NSN 6640-01-272-4529 is a Air Flow Indicator Kit, manufactured by Major Safety Service, Inc. Dba Major Safety Service Inc, classified under FSC 6640, Laboratory Equipment and Supplies. Status: active.
NSN 6640-01-272-4529 has 1 manufacturer part number on file: CH 25301 (Major Safety Service, Inc. Dba Major Safety Service Inc).
Key specifications for CH 25301: General Characteristics Item Description: DESIGNED FOR VISUAL DETERMINATION OFF DIRECTIONAL PATTERN OF AIR CURRENTS AROUND AIR DUCTS,VENTILLATING/HEATING SYSTEMS AND LAB HOODS; C/O 6 SMOKE TUBES ALLOWING 100 TESTS EACH,ASSPIRATOR BULB,TUBE-TIP BREAKER AND OPTIONAL CARRYING CASE; TUBES PROVIDE A VISIBLE WHITE SMOKE. 1 specification is documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). 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.