Does Higher Merv Rating Restrict Airflow?

When it comes to air quality, higher Merv ratings are the most effective. However, they can also cause damage to your HVAC system. This is because a higher Merv rating means higher resistance, which in turn leads to less airflow. Fortunately, most modern HVAC systems are able to handle higher Merv filters without any issues.

The main risk of high-efficiency air filters is that they are not modified for long periods of time. Therefore, it is important to keep up with changing filters in order to avoid any filter-related issues with your HVAC system. It is true that a filter with a higher MERV rating will reduce airflow. However, there are other factors at play such as the size of the filter and the type of fan motor in your HVAC system. Using an air filter with a MERV rating that is too high can be just as bad as using one that is too low.

This is because the thickness of the filter material can restrict airflow, leading to decreased comfort, increased energy use, and accelerated wear and tear on HVAC components. In particular, using an air cleaner with a MERV rating that is too high can damage the compressor, heat exchanger, and air conditioner coil. High-efficiency air filters capture higher percentages of particles, as well as smaller particles. Generally speaking, MERV-13 is the ideal rating for most HVAC systems. Research shows that in general, HVAC systems with high MERV* filters have a higher pressure drop across the entire filter. The MERV rating system is standard and provides a good indication of the effectiveness of an air filter in your central split HVAC system.

The higher the rating, the better the filter. With all due respect Allison, I question the need for Merv 13 filtration. If you're worried about the effects of inhaling fine air particles, then a Merv 11 air filter might be a better option. MERV 8 air filters are quite common and offer a good balance between price and performance. However, if you are concerned about outdoor air pollution or have family members with respiratory problems or pets in the house, then a higher MERV rating might be a good idea.

It's best to comply with furnace manufacturer's recommendations or consult an HVAC professional to determine exactly which MERV rating is best for your specific system. Not all filters have a Merv rating &, many of them are purchased at large stores. However, it is important to remember that increasing a filter to a higher MERV can increase the delta P across the filter. Therefore, it is important to choose an appropriate MERV rating for your HVAC system in order to ensure optimal performance and avoid any potential damage.

Dianna Lapere
Dianna Lapere

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