Merv Filters LLC 18x20x4 MERV 8 furnace filter protects you and your family from allergies and sinus irritation that leads to watery eyes, itchy throat, coughing, and sneezing; by removing airborne particles such as pollen, dust, pet dander, and other fibers from indoor air in your home. In addition to a healthy environment, it also extends the life of your HVAC system by making it run more efficiently.
With a greater surface area, our 18x20x4 MERV 8 air filter is capable to catch airborne particles with less airflow resistance, helping your system to operate more efficiently. These air filters are electrostatically charged and constructed with 100% synthetic media that is unaffected by moisture, does not support microbial growth. These air filters are recommended to change every 30 to 90 days for optimum performance. The MERV 8 rating that this filter removes 85% of airborne particles between 3.0 and 10.0 microns.
Important Note: When it comes to purchasing MERV 8 filter 18x20x4, make sure you measure its width, height, and thickness to get the right size filter. Normally, the actual size of the filter is a bit smaller than the nominal size. If the nominal size is 18x20x4, the actual size will be 17.5×19.5×3.75