Ocenco M-20.2 EEBD SCBA Air Time Calculator

IMPORTANT: The Ocenco M-20.2 uses compressed OXYGEN, not compressed air. It is the world's smallest belt-worn EEBD, rated for 10 minutes working escape or up to 32 minutes at rest. SOLAS, MED, and NIOSH certified for vessel crew and industrial emergency egress — not firefighting entry.

Compressed oxygen vs compressed air: why the M-20.2 is different

Standard SCBA uses compressed air (approximately 21% oxygen, 79% nitrogen). The M-20.2 uses 100% compressed oxygen. This allows an extremely small cylinder (0.4L at 200 bar = 80L total gas) to provide meaningful breathing duration, because every litre of gas is breathable rather than mostly inert nitrogen. The consequence is that standard SCBA air time formulas do not directly apply — and 100% compressed oxygen cannot be used in fire environments due to extreme flammability risk. The M-20.2 is strictly for escape away from fire hazards, not into or through them.

Rated duration: 10 minutes working vs 32 minutes rest

NIOSH certification for the M-20.2 is at 10 minutes of working-level activity. In sedentary or low-activity conditions (sheltering in place while awaiting rescue), duration can extend to 32 minutes. The difference reflects oxygen consumption rate: working conditions increase metabolic demand and oxygen use. For planning vessel emergency response, SOLAS drill procedures typically assume 10-minute escape duration. The extended 32-minute estimate is relevant for barricade-in-place scenarios where movement is minimal.

M-20.2 deployment: vessel crew escape kits

The M-20.2 weighs 1.4 kg and is designed to be worn on a belt or stored in a personal escape kit. On SOLAS-regulated vessels, crew emergency equipment often includes an EEBD alongside an immersion suit. The M-20.2's compact size makes it practical for continuous belt wear in high-risk areas (engine rooms, cargo holds) where emergency egress from a sudden gas release or fire requires immediate breathing protection without time to reach a full SCBA.

Why this calculator uses modified RMV presets for the M-20.2

The M-20.2 RMV presets (1.5–2.5 L/min) are not standard firefighting breathing rates. They represent effective oxygen depletion rates configured to approximate the manufacturer-certified duration range (10–32 minutes) from the 80L total oxygen supply. Standard 30–75 L/min presets would calculate durations of under 3 minutes — meaningless for this device. Always refer to manufacturer documentation for certified duration; these presets are approximations for planning reference only.

FAQ

Ocenco EEBD & SCSR Duration Calculator – M-20.2 and EBA 6.5

Important: Ocenco devices are NOT conventional compressed-air SCBA. The M-20.2 is a belt-worn EEBD (Emergency Escape Breathing Device) using compressed oxygen, rated for escape from hazardous atmospheres — not entry or firefighting. The EBA 6.5 is a SCSR (Self-Contained Self-Rescuer), a closed-circuit rebreather using oxygen for extended mining escape. Standard SCBA air time formulas do not directly apply to oxygen-based or rebreather devices. The duration estimates on this page use modified inputs to approximate rated duration — always refer to manufacturer documentation for certified duration.

EEBD vs SCBA vs SCSR: critical distinctions

An SCBA (Self-Contained Breathing Apparatus, EN 137 / NFPA 1981) is certified for entry into IDLH atmospheres and structural firefighting. An EEBD (EN 1146 / NIOSH 42 CFR 84) is certified for emergency escape only — evacuating from a hazardous area to safety — not entry. An SCSR (MSHA/NIOSH for mining) is a closed-circuit rebreather for self-rescue in mining emergencies, typically with much longer rated duration due to oxygen-scrubbing chemistry. Using an EEBD or SCSR as a substitute for entry-certified SCBA is not permitted under any safety standard and creates serious risk.

Ocenco M-20.2: compressed oxygen EEBD — not compressed air

The Ocenco M-20.2 uses a compressed oxygen cylinder (0.4L at 200 bar), not compressed breathing air. This matters for calculation: standard SCBA formulas assume nitrogen-oxygen air mixture. With 100% oxygen, the demand valve flow rate, cylinder charge, and rated duration are calculated differently by the manufacturer. The M-20.2 is NIOSH-rated for 10 minutes at working level or up to 32 minutes at rest. The calculator inputs for this unit are configured to approximate this rated range — do not override with custom pressure inputs unless you have manufacturer documentation supporting different values.

Ocenco EBA 6.5: closed-circuit rebreather for mining escape

The EBA 6.5 is MSHA and NIOSH certified for mining self-rescue operations. It operates as a closed-circuit rebreather: exhaled breath passes through a CO2 scrubber, has oxygen replenished from the cylinder, and is re-breathed. This dramatically extends duration compared to open-circuit SCBA at the same cylinder size. The EBA 6.5 is rated for 60 minutes of active escape or up to 8 hours in a waiting/survival shelter scenario. The calculator uses approximate inputs; actual duration depends heavily on workload and CO2 scrubber performance.

Why standard RMV values don't apply to the M-20.2 and EBA 6.5

Standard firefighting RMV presets (30–75 L/min) reflect open-circuit air consumption rates. Closed-circuit devices (EBA 6.5) recycle exhaled gas, so total oxygen consumption per minute is far lower than equivalent open-circuit consumption. The M-20.2 (demand-flow oxygen) uses a different demand flow profile. RMV presets on these models are set to reflect effective oxygen depletion rates that approximate manufacturer-rated duration, not direct L/min breathing rates.

Where Ocenco devices are typically deployed

The M-20.2 EEBD is the world's smallest belt-worn escape device and is used extensively in vessel crew escape kits (SOLAS-regulated), industrial facility emergency egress, and confined space rescue support. The EBA 6.5 is primarily a mining emergency device for self-rescue from collapsed or gas-hazard environments. Neither is a firefighting tool — their value is in escape and survival, not entry and suppression.

FAQ

This is an estimate based on the values you enter. Real-world air consumption changes with workload, stress, temperature, mask seal, leaks, and individual physiology. Always follow your SOPs and monitor your pressure gauge continuously.