When it comes to air filters, you might think that a higher MERV rating means a better filter. However, this isn't always the case. The best MERV rating for your needs is the one that allows your unit to operate efficiently. If the filter is too dirty or too strong, it can cause airflow problems that can reduce efficiency and performance.
To measure resistance, filters use the MERV rating system. In short, the higher the MERV rating, the stronger the filter will be. This rating is essential to finding the right furnace filter for your home. Using an air filter with a MERV rating that is too high can be just as bad as using one that is too low.
Air filters with higher MERV ratings can filter more, but the thickness of the filter material can restrict airflow. Restricted airflow can decrease comfort, increase energy use, and accelerate the wear and tear of heating, ventilation and air conditioning components. In particular, using an air filter with a MERV rating that is too high can damage the compressor, heat exchanger and air conditioning coil. Usually, a filter with a higher MERV rating will reduce airflow.
However, there are many other factors at play, such as the size of the filter and the type of fan motor in the HVAC system. MERV 11 air filters can capture a large percentage of fine particles, but MERV 8 air filters cannot. In fact, even filters with high MERV ratings can be used in some systems with minimal pressure drop. While the air filter is designed to control the amount of unwanted air particles entering your home, its MERV rating helps you determine which filter is best suited for your home.
Choosing the right MERV rating is an important decision in terms of total cost, air quality and product durability. On the other hand, air filters with a MERV 14 rating or higher are designed for commercial air conditioning systems that can withstand thicker filter material. Each air filter has its advantages and disadvantages, but both MERV 8 and MERV 11 air filters are suitable for residential use. The maximum MERV rating your system can withstand depends on many factors besides the boiler model.
If you're trying to decide between a MERV 8 air filter and a MERV 11 air filter, here's what you need to know: while higher MERV ratings are more effective for air quality, they can damage your air conditioning system. With the lowest MERV rating (1-), the filter will still capture pollen, dust mites, cockroach debris, sanding dust, spray paint dust, textile fibers and carpet fibers. However, if you're concerned about outdoor air pollution, family members with respiratory problems or pets at home, it might be wise to opt for a higher MERV rating. In addition, a MERV 12 filter that is only 1 inch thick is likely to be more restrictive than a 4 inch thick MERV 12 filter.
If the MERV rating is too high for your furnace motor or air treatment system fan to withstand, low airflow will result. As an expert in HVAC systems and air filters I recommend considering all factors before deciding on which type of filter to use in order to ensure optimal performance and efficiency.
