The Mask,chemical-Biological, cataloged under National Stock Number 4240-01-370-3822, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4240-01-370-3822 |
| Item Name | Mask,chemical-Biological |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Carrier Position Type | ONE POSITION |
| Filter Type | CANISTER |
| Mounting Position | LEFT CHEEK OR RIGHT CHEEK |
| Quantity | 1 |
| Microphone | NOT INCLUDED |
| Spectacle Usage Provision | PROVIDED |
| Canister to Facepiece Attachment Method | DIRECT |
| Carrying Facility | CARRIER |
| Facepiece Speaking Diaphragm | INCLUDED |
| Carrying Position for Which Designed | LEFT SIDE OR RIGHT SIDE |
| Quick Disconnect Coupling Feature | INCLUDED |
| Size Designation | MEDIUM |
| Canister Carrying Harness | INCLUDED |
| Face Cover Type | FACEPIECE |
| Protection for Which Filter Is Designed | WAR GASES |
| Material | SILICON LOCATION NOT OTHERWISE SPECIFIED |
| Material | PLASTIC POLYCARBONATE LENS |
| Material | PLASTIC POLYESTER HEAD HARNESS |
| Canister Manufacturer Symbol | C2A1 |
| Particulate Filter | INCLUDED |
| Carrier Wearing Position | LEFT SIDE OR RIGHT SIDE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Reference | Meaning |
|---|---|
| 5-1-2740-20 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4240-01-370-3822 is a Mask,chemical-Biological, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
Key specifications for 4240-01-370-3822: Carrier Position Type: ONE POSITION; Filter Type: CANISTER; Mounting Position: LEFT CHEEK OR RIGHT CHEEK; Quantity: 1. 21 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.
NSN 4240-01-370-3822 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.