Did you know that the average Canadian spends 90% of their time indoors?  Did you know that the air inside the average Canadian home is 3-5 times more polluted than outdoor air?  Today’s homes are designed to be more energy-efficient than they have been in the past.  To achieve this, the building envelope has been sealed up practically air-tight, thus minimizing natural ventilation (air leakage) and trapping pollutants within the home.