1. 10x20x1 air filter MERV 13 is comparable to MPR 1500 and ideal for basic residential and commercial use. Filters should be replaced every 90 days, family with pets, children should replace it more ofen to ensure your air stays clean and furnace works properly.<br> 2.Advanced pleated filters deliver multiple benefits – greater surface area means more air coverage, thicker for great capture capacity, and extended life for your AC or furnace.<br> 3.Recyclable Filter frames are made of strong and high heat-resistant PET material, which can be cleaned and reused. You just need to replace the inner filter paper only.<br><br>