If the air quality of your Grand Traverse County home is important to you, you need to find an air filter that can perform. You may know that air filters have MERV ratings that help you evaluate how efficient they are. Did you also know that there are five other ratings to take into consideration when choosing a filter?
- Arrestance is a rating that measures how well a filter catches dust particles. Because arrestance is rated under test conditions that use larger dust particles than you find in your house, it’s not the best rating to base your purchase on. However, it can give you some basis of comparison to use in addition to the other ratings.
- Pressure drop, or filter resistance, measures how much effect the filter has on airflow versus what the airflow would be without a filter. A higher pressure drop means less efficiency, so you want a lower number on this rating. In practical terms, the pressure drop becomes greater as a filter gets clogged with dust and debris, which is why it’s important to change or clean your filter on a regular schedule if you’re looking for maximum efficiency.
- Dust holding capacity is a rating that measures how much dirt a filter can hold at a given pressure drop. Since this rating is based on performance at a specific pressure drop, it’s important to compare dust holding capacities of two filters at the same pressure drop to get an accurate picture of which filter is better.
- Dust spot efficiency measures a filter’s dust particle removal ability. Like arrestance, this is done under test conditions with larger particles, so it shouldn’t be the only factor in determining your filter choice.
- Efficiency measures how well a filter removes dust, bacteria, pollen, mold and gases from the air. You have both an initial efficiency rating, which measures the efficiency when the filter is new, and a sustained efficiency rating, which measures the efficiency over time.
For more information about finding an air filter that can perform or other HVAC questions, contact Team Bob’s Heating Cooling Plumbing. We have been helping Grand Traverse County residents with their HVAC issues for more than 30 years.
Our goal is to help educate our customers in Traverse City, Michigan and surrounding areas about energy and home comfort issues (specific to HVAC systems). For more information about air filters and other HVAC topics, download our free Home Comfort Resource guide.
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