How to Get the Ventilation That You Need in Your House
Canadian houses are relatively airtight, and have been for years. The old farmhouses where people lived several generations ago had little resistance to air. They were drafty, uncomfortable and very dry in winter due to high air-change rates. Modern housing restricts air entry through good air barriers and sheet materials, such as plywood, oriented strand board (OSB) and drywall.
In fact, new Canadian houses and many retrofitted existing houses are so airtight that you cannot count on incidental leakage for good indoor air quality. You must induce or augment the house air-change rate using mechanical ventilation, a requirement in the National Building Code for new houses since 1990.
What Does This Mean to You?
If your house is stuffy, odours linger, or humidity is high in fall and winter, it is likely that your house does not have adequate fresh air. If you or your children have respiratory conditions, such as asthma, bronchitis or chronic colds, getting the proper amount of fresh air is even more important.
Opening windows can be part of the solution, but open windows can be a security risk (in some neighbourhoods), can cause comfort problems and can increase heating and cooling costs. Furthermore, opening windows may not improve indoor conditions under all circumstances. Using a mechanical ventilation system, such as an exhaust fan or a heat recovery ventilator (HRV), can be more effective.
Ventilation is often defined as a means of providing fresh air. However, the word “ventilation” can describe several different types of air movement.
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