| Column 1 | Column 2 |
|---|---|
| 5-10 m³/hr.m² | Intermittent extract fans with trickle vents to windows |
| 3-5 m³/hr.m² | Decentralised Mechanical ventilation system with trickle vents to windows. |
| < 3 m³/hr.m² | Full house mechanical ventilation system (Mechanical ventilation heat recovery system) |




