The main job of a furnace filter is to block dust and airborne particles such as dust mites, pollen, mold spores, pet dander, dust and smog that over time may clog filter motor and reduce your HVAC’s performance, eventually leading to breakdowns. So, every homeowner should check their HVAC system on a regular basis and replace air filter after one to three months.
When you notice that your HVAC system is working hard to produce heat or cool air, your monthly bills are increasing, your pet is sneezing, or your children are suffering from an asthma attack in the middle of the night. It must be time to change the air filter. Replacing your filter can help you breathe fresh air, improve system efficiency and lower your monthly energy bills.
Merv Filters LLC is your leading source to meet all your HVAC air filter needs. We offer MERV 13 air filters in 45 various sizes, eliminating 96% of airborne particles, such as fine particulates, bacteria, smoke, gases & odors, and allergens. All our products are proudly made in the USA and chemical-free. Our 18x20x4 MERV 13 furnace filter is designed using 100% synthetic graduated density filter media, moisture resistant beverage board frame, and galvanized steel expanded metal support grid. This 18x20x4 MERV 13 filter is 100% water repellent and has high dust holding capacity with the low-pressure drop.
Important Note: When it comes to buying 18x20x4 MERV 13 air filter, make sure you get the right size filter. Because when you order it, you will receive the filter with an actual size of 17.5×19.5×3.75