It's easy for homeowners to become confused with all of the information, and misinformation, out there about residential mechanical ventilation. Below are five common myths of ventilation in today’s tightly sealed homes, along with facts that help dispel them.
1. Myth: Mechanical ventilation is not necessary as long as you open up windows.
Fact: Operable windows have many shortcomings as an effective ventilation solution in the home. You can't rely on a specific ventilation rate due to constantly changing conditions such as wind speed and direction, temperature and pressure differences between indoors and outdoors, whether or not heating and air conditioning systems are running, and many other factors. Comfort can be a significant concern in certain climate zones. Also, open windows can be a source of dust and noise, and can be a personal security issue.
2. Myth: You can always trust a manufacturer’s marketing literature as a gauge for how a product will perform.
Fact: Unfortunately, some manufacturers exaggerate performance claims to gain a competitive edge in the marketplace. HVI Certification provides assurance that specific manufacturer claims have been tested and validated by an independent third party.
3. Myth: More powerful fans result in higher operating costs.
Fact: A powerful, ENERGY STAR-qualified fan will use less energy than an inefficient small one. HVI recommends selecting fans that are appropriately sized for each dwelling.
4. Myth: Fans need to be loud in order to be powerful.
Fact: A variety of powerful, yet extremely quiet models are available. Any fan with a sone rating less than 1.5 is very quiet; equivalent to that of a refrigerator. The HVI Certified Products Directory is a great reference source when looking for a fan with a low sone rating.
5. Myth: A fan’s installation has no bearing on its performance.
Fact: Even the most powerful, quiet and expensive fans have little chance of meeting your performance expectations if they are not installed and ducted properly. HVI recommends you work closely with your contractor/installer to ensure optimal performance. Products should be installed according to the manufacturer’s instructions, and duct runs should be as short and as straight as possible.
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