Options for ventilation
Ideally the air in a home should be ‘‘renewed’’ every two hours, even when you are not at home.
Some simple options are to fit aluminium windows with passive air vents or to fit security stays that allow the windows to be left ajar.
When windows and doors cannot be left open, consider mechanical ventilation systems and air conditioning systems:
Heat recovery ventilation systems (HRV units) take fresh outdoor air which is then carbon filtered and pumped through a heat exchanger using the heat