RV AIR filters clean the air before it gets into your RV's air conditioner, capturing particles as small as three to ten microns, including pollen, dust, mold sports, pet dander and other allergens. American made, and constructed of unwoven polyester, this RV MR filter has a PA E RV 6 rating, so you'll breathe easy wherever the road takes you. Because no matter how luxurious your RV may be, you're only as comfortable as the air you breathe.