Honeywell (Survivair / Fenzy) SCBA Air Time Calculator

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

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Honeywell SCBA Air Time Calculator (Survivair / Fenzy Planning Estimate)

Different regions use different Honeywell product families (Survivair, Fenzy, and related lines), but the air math stays the same. This Honeywell SCBA Air Time Calculator estimates remaining time using cylinder water volume, usable pressure after reserve, and RMV (L/min). Use it for training and pre-plans—not for compliance or official documentation.

How firefighters use this estimate

  • Training: practice realistic decision points for exit time and air checks.
  • Pre-plans: estimate air needs for long-distance travel, stair climbs, and large-area search.
  • Crew briefings: align on reserve pressure and conservative RMV assumptions.
  • Familiarization: compare how cylinder choices affect planning time.

RMV selection: don’t underestimate stress

RMV can jump under heat, stress, and urgent movement. If you do not know your RMV, start conservative: Light ~25–35 L/min, Moderate ~35–50 L/min, Heavy ~50–70+ L/min. Many crews plan closer to heavy for interior operations.

Reserve pressure is a safety buffer

Reserve pressure is protected air for egress, unexpected delays, and assisting a partner. Follow your department SOPs. Subtracting reserve gives a clearer estimate of interior work time.

Why real air time may be shorter

Small leaks, temperature effects, poor seal, and workload spikes can shorten real duration. Treat this tool as a training aid and verify with drills and gauge readings.

FAQ

No. It is a planning estimate. SCBA duration varies by configuration and real operating conditions. Always follow SOPs and monitor your gauge.

Use your cylinder water volume (L) and starting pressure (bar). Keep reserve pressure aligned with your department policy.

Plan conservative. For interior work, heavy-work RMV (50–70+ L/min) is a safer default than optimistic values.

No. This tool is intended for training and planning only. Use your department procedures for official documentation.

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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