Outdoor Air & Ventilation Planner
Screen outdoor-air flow using people, floor area, air-change and CO₂ assumptions before sizing ventilation equipment.
Method & limitations
People and area rates, ACH, and CO₂ generation are explicit user assumptions. Selected flow is the larger of people-plus-area and ACH paths; CO₂ flow is shown separately under a steady-state mixed-room model. Verify against the applicable ventilation standard before design. This screen does not certify code compliance or replace filtration, pressurization, or commissioning checks.
Formulas, source and scope
Q_people = N·q_person; Q_area = A·q_area; Q_ACH = ACH·V/3600; Q_selected = max(Q_people + Q_area, Q_ACH); Q_CO2 = N·g /(C_in − C_out) × 1000, with g in L/s·person and concentrations in ppm.
Formula source: site methodology / engineering assumption in this repository. No standard edition is pinned for this tool.
FAQ
What do the default inputs return?
20 people, 200 m², 0.0025 m³/s·person, 0.0003 m³/s·m², 0.5 ACH, 600 m³, 420 to 1000 ppm and 0.005 L/s·person give people 0.050, area 0.060, ACH 0.083, selected 0.110 and CO₂ check 0.172 m³/s.
Does the CO₂ flow replace the selected flow?
No. It is a separate steady-state check. The selected flow is only the larger of people-plus-area and ACH.
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