Design Tools
Ventilation Planner
Good ventilation is planned, not left to chance. Select a room and enter its floor area to get guidance on opening size, placement and whether you need mechanical exhaust.
Living / Drawing Room · 150 sq. ft.
Minimum opening
15 sq. ft.
10% of floor area
Ideal opening
22.5 sq. ft.
15% of floor area
Placement guidance
- Openings on two different walls where possible, to allow cross-ventilation.
- Larger openings on the wall facing the prevailing breeze direction.
- Keep at least one high-level ventilator to let hot air escape.
Living rooms benefit most from cross-ventilation — a single-wall window relies entirely on wind pressure changes to move air.
This is general design guidance based on common residential practice, not a structural or local building-code compliance certification. Confirm final openings with your architect or our design team.