Why is passive ventilation needed?
Today’s homes are practically airtight with draught sealed windows and doors. Moisture and airborne pollutants, created by the residents and sometimes by the building process itself cannot escape. Excessive condensation is the most visible result, although the resulting poor air quality is also a serious health issue, particularly affecting asthma sufferers. Doors and windows often cannot be left open for security reasons. Passive background ventilation overcomes this problem by providing continual, cost and maintenance-free, ventilation even when the home is locked up or left unattended.
