Filters within a merv rating of 17 to 20 are almost never needed in a residential home. A merv rating of 13 to 16 is considered hospital-level air quality, so your home is unlikely to need more than that. When installing an air filter with a high MERV rating, two things happen. First of all, the air becomes cleaner, which can help improve the longevity of your HVAC system.
The more particles are trapped, the less they stick to the inside of the vent and the better the air flow. Generally, 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 of the HVAC system. A Merv 11 air filter has a higher efficiency rating.
That is, it can capture finer particles and remove more pollutants from the air. But is the MERV 11 too tall for your needs? Not all filters have a Merv. Not all filters have a Merv rating %26, many of them are purchased at big box stores. Owning pets would require a MERV 10 to control their dander, which tends to have smaller particles than the contaminants discussed above.
Choosing the right MERV rating is an important decision in terms of overall cost, air quality, and product durability. Merv 13 filters, for example, also remove bacteria, tobacco smoke, car fumes, insecticide dust, pet dander and more. Filter technology has grown by leaps and bounds over the years, and merv ratings are designed to help us find the most effective and efficient air filter options for heating and cooling systems and beyond. I have two identical sizes.
I have two identical sized MERV12 filter filters from 3M in my bank. In addition, a MERV 12 filter that is only 1 (one inch) thick is likely to be more restrictive than a 4 (four inch) thick MERV 12 filter. While ASHRAE recommends MERV 13 and 14, it's best to select a filter with the highest possible MERV rating for your specific HVAC system. AC troubleshooting: If this problem occurs after installing a high MERV filter, the filter is likely to be the problem.
Raising just three levels of MERV rating can be a smart move that makes air cleaner or a detrimental option for the entire HVAC system when considering the MERV 8 vs. MERV 11 airflow capabilities. Meanwhile, air filters with a MERV rating of 14 or higher are designed for commercial HVAC systems that can handle the coarsest filter material. A higher MERV rating often means lower airflow, which can cause the system to work harder and use more energy to do its job.
One thing to keep in mind is that a MERV 11 air filter may need to be replaced a little more frequently than a MERV 8 air filter. Generally speaking, anything under a merv 13 air filter should provide very efficient air purification in a house without affecting airflow.