Controlled Airflow
Continual Exchange Design
AIR CHANGING NEEDS TO BE CONTINUAL; intermittent is not sufficient any more with the loss of all natural continual ventilation in properties. The only real solution is to create a mechanical method of continually replacing the air. Properties are used differently to how they were intended with working from home creating higher daytime occupancy, higher occupancy in general due to a rising population using the same number of properties, the introduction of bathrooms and wet rooms, the introduction of kitchens away from chimneys, the cultural change in opening windows, and the sealing of all draughts and natural air infiltration.
All air exchange needs to be designed to flow in a controlled manner without the introduction of random air movements from wind pressure. Air flow is controlled by the introduction of low-pressure points and high-pressure points. Air will flow from the high-pressure points to the low-pressure points, and each needs to be positioned so that stale or damp air is extracted at its closest point and fresh air is introduced to the property. A clear line of flow needs to be achieved without obstructions.
The Solution
Fit CONTINUALLY-RUNNING fans in bathrooms, kitchens or any room where water vapour is created such as a room used for drying clothes, utility rooms, any WC or other room with a hot water tap, or any room used for making hot drinks outside of the kitchen. These fans need to extract to outside at their closest, practical point.
Fit PASSIVE AIR-INLET VALVES, or motorised air supplies, at points as far away from the extract fans as practical but with a clear line of air flow. These will then provide the high-pressure points at the opposite sides of the property which will then reduce stale spots where air does not get exchanged. All air in the property should be capable of being exchanged and flow paths should be designed to deal with all air.
Ensure a clear line of flow by removing any obstacles and cutting doors at the base so air can flow under them when they are closed.