There is an air ventilation system with your property that should be left on at all times.
Keeping the ventilation system switched on will reduce the moisture produced by everyday activities such as cooking, ironing and showering.
Heat Recovery Systems are within the properties where the windows do not open. Fumes that are built up in the property are extracted by way of carbon filters which are built into the external walls. This acts by bringing cool air into the property and regulating the temperature of the property. Please note that this does not act as a cooling system.