The CM-7M® CBRN military gas mask was designed and developed in cooperation with Czech Army specialists, specifically for use with a wide array of optics for advanced tactical capability. The civilian designation of the OM-90 — the current military issue mask for the Czech Armed Forces — this is not a downgraded civilian version. It is the same platform, produced in the same factory, to the same standards.
Key Features
- Natural cheek weld and proper eye relief across a wide variety of rifle and optic setups. Compatible with NVGs and night optical devices.
- Bromobutyl rubber facepiece provides extraordinary protection against all known chemical, biological, radiological, nuclear, and industrial chemical agents.
- Pre-installed drinking system enables safe hydration in contaminated environments. Compatible with CamelBak bladders via Type M adapter (not included).
- Sweat drainage through the exhalation chamber, anti-fog inner mask, and hypoallergenic construction. Helmet and breathing apparatus compatible.
- Rd 40×1/7" filter thread (EN 148-1) fits the widest range of readily available filters. Filter canister mounts on either side for right- or left-handed use.
- Minimum 95% speech intelligibility. Easy communication with or without communication devices.
Technical Specifications
| Component | Specification |
| Facepiece material | Bromobutyl rubber, non-irritating |
| Inner mask & rubber components | Natural rubber, non-irritating |
| Visors | Silicate glass |
| Plastic components | Polyoximethylene, polyamide |
| Speech diaphragm | PET |
| Head harness | Five-point, rubber-textile |
| Average weight | 500 g |
| Color | Black |
| Number of sizes | 3 |
| Effective field of vision | 71.5% |
| Binocular field of vision | 34% |
| Filter connection thread | Rd 40×1/7″ (EN 148-1 / NATO standard) |
| Resistance against NBC agent penetration | >48 hours |
| Minimum speech intelligibility | 95% |
| Liquid intake rate | 230 ml/min |
| Functional reliability | −30°C to +70°C |
| Service life | 20 years from date of production |
Breathing Resistance
| Measurement | Flow Rate | Value |
| Inhalation resistance | 30 l/min | max. 20 Pa |
| Inhalation resistance | 95 l/min | max. 50 Pa |
| Exhalation resistance | 30 l/min | max. 60 Pa |
Certifications & Compliance
Size Guide
| Size | Facial Height (nose bridge – chin) | Face Width (bizygomatic) |
| Size 1 (Small) | 108 – 120 mm | 125 – 140 mm |
| Size 2 (Medium) | 120 – 128 mm | 140 – 148 mm |
| Size 3 (Large) | 128 – 138 mm | 148 – 156 mm |
- Size 2 (Medium) fits 95% of the population and is the recommended default choice.
- Size 1 (Small) is recommended for users 130 lbs or under with thin, narrow faces.
- Size 3 (Large) is recommended for users over 250 lbs with wide faces.
- To confirm fit: block the inhalation valve and take a deep breath. The mask should seal tightly to your face (negative pressure test).
Storage & Service Life
20 years from date of production when recommended storage conditions are observed.
Functional from −30°C to +70°C. Store in a clean, dry location away from direct sunlight and chemical vapors.
Please note: Gas mask filters are NOT included. Please select the appropriate size from the dropdown menu. The MIRA Vision® Spectacle Kit is sold separately.
