Insulation/ CALCULATOR
Convert floor area, average ceiling height and a chosen air-change rate into continuous airflow.
FROM ESTIMATE TO ACTION
Measure floor area and clear height for the same connected spaces. For mixed heights, add the room volumes and divide by total floor area; do not weight height by room volume or apply the peak ceiling height everywhere. Exclude zones served by another system. If zones require different air-change rates, calculate each separately and add non-overlapping flows rather than averaging the rates.
Record the source and applicability of the chosen rate to this building and task. The example is not a universal ventilation requirement: 100 m² × 2.8 m = 280 m³; at 0.5 1/h the flow is 140 m³/h, or 38.89 L/s. At 1 1/h the same volume gives 280 m³/h. Changing the input rate changes the estimate; it does not establish which rate is required.
140 m³/h × 24 h gives the displayed 3360 m³/day only at constant continuous flow. For 8 h at that flow, calculate 140 × 8 = 1120 m³ separately; the displayed daily total does not model that schedule or justify shorter operation. Compare measured supply and extract at the actual operating setting, filter condition and duct resistance with the room requirements. A catalogue maximum or this total is not a commissioning record.