If you have natural ventilation and you get an airtightness test result less than 3m3/hr/m2, your home is too airtight. You need to introduce mechanical ventilation to help deliver adequate fresh air
If you have natural ventilation and you get an airtightness test result less than 3m3/hr/m2, your home is too airtight. You need to introduce mechanical ventilation to help deliver adequate fresh air