Interspiro QS II SCBA Air Time Calculator

Select a model, choose a cylinder, enter pressure and RMV to estimate time remaining.

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Auto-filled from cylinder default (editable).
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Interspiro SCBA Air Time Calculator (Firefighter Planning Estimate)

Air time is not just cylinder size—it’s workload, heat, and pace. This Interspiro SCBA Air Time Calculator estimates remaining time using cylinder water volume, usable pressure after reserve, and RMV (L/min). Use it to improve planning and training realism, not as a substitute for gauge readings or SOPs.

Good use-cases for firefighters

  • Training: compare controlled search vs high-intensity work to see time differences.
  • Pre-plans: estimate air needs for long corridors, stairs, basements, and big-box layouts.
  • Crew planning: set a conservative reserve and RMV baseline before entry.
  • Safety culture: reinforce early exits and frequent air checks.

RMV drives the result

RMV changes quickly with stress and heat. If you do not have measured RMV, plan with conservative ranges: Light ~25–35 L/min, Moderate ~35–50 L/min, Heavy ~50–70+ L/min. For complex incidents, the heavy-work range often better matches reality.

Reserve pressure protects exit time

Reserve pressure protects egress and unexpected problem-solving time. It reduces interior work time on paper, but increases your safety margin when conditions change.

Reality factors that shorten air duration

Leaks, temperature, poor seal, radio traffic, and rapid movement can reduce real air time. Treat results as an estimate and validate through training evolutions.

FAQ

No. It is a training and planning estimate. Always follow SOPs and monitor your pressure gauge during operations.

If you do not have personal measured data, plan conservatively using a heavy-work RMV (50–70+ L/min), especially in high heat or long travel distance.

Reserve pressure is a protected safety buffer for egress and emergencies, not extra work time.

Fitness, stress response, pace, heat exposure, and task intensity can all change RMV and duration.

Notes & safety

This is an estimate based on entered values. Real-world air consumption changes with workload, stress, temperature, mask seal, leaks, and training. Always follow SOPs and monitor your pressure gauge.

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