The Minimum Efficiency Reporting Value (MERV) rating of an air filter is a measure of how effectively it prevents dust and other contaminants from passing through the filter and reaching the air stream. MERV ratings range from 1 to 16, with higher indexes trapping small particles more effectively than filters with lower indexes. A MERV 11 air filter has a higher efficiency index, meaning it can capture finer particles and remove more contaminants from the air. But is the MERV 11 too high for your needs? 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. As the MERV rating increases, the filter medium tends to become denser and thicker to capture more contaminants from the air, which could result in slightly greater air restriction. If you're looking to protect your family from outdoor air pollution, or if someone in your home has respiratory problems or allergies, then opting for a higher MERV rating might be a good idea. Keep in mind that a MERV 11 air filter may need to be changed more often than a MERV 8 air filter.
In general, filters with a MERV rating of 16 or lower are suitable for residential, commercial and general hospital use. Air filters with a MERV 14 rating or higher are designed for commercial air conditioning systems that can withstand the thickest filter material. If you're concerned about the effects of inhaling fine air particles, then choosing a MERV 11 air filter instead of a MERV 8 air filter is recommended. Although they may seem similar, there are some clear differences between them.
A higher MERV rating often means lower airflow, which can make the system work harder and use more energy to do its job. The maximum MERV rating your system can withstand depends on many factors besides the boiler model. If someone in your home has an allergy or respiratory problem, opt for a MERV 11 air filter or even a MERV 13 air filter.
