Filterbuy 20x21.5x1 Air Filter MERV 11 Superior Pet & Allergy Defense (2-Pack), Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 19.88 x 21.50 x 0.75)

I searched high and low for the right size of filter my house is older so it is harder to come by but these were wonderful! Great quality, the airflow is wonderful as well! Best value for the price as the filter functions just as it says and protects your house! My household noticed a difference within 24 hours! We do have a small dog and it works great with her!

Significantly reduces common allergens and particulates compared with standard filters. Good quality, fits perfectly

These are not 4" wide , they are 3-3/4" the old one setting next to the new one. I have had these for a few months cause I purchased after I installed my last one so Bought these for replacements when needed . Or else Id return them ! I dded duct tape on one side so It doesnt pull air from around the side

They seem to be working the way they should I went from a merv 8 to the merv 11 but only time will tell, good solid product build.

Great filters and best price.

Worked as designed.

These furnace filters are true to size. Perfect fit.

My ac air filter has a uncomment size which is 17x20x1. I can't find this size anywhere in the local store. I am glad I found it online and it fits perfectly. This filter's quality is awesome because I can feel the difference without it. it traps most of airborne particles as small as microns, including dust, pollen, pet dander, mold spores, and even some bacteria. Within a week of installing it, I noticed a dramatic difference: less dust on my shelves and furniture, no more sneezing fits when the AC kicks on, and a noticeable reduction in pet odors.

tres sastisfait

It does what it says it should filtering the air

Does a great job of keeping air clean in house

good value for this product

Great quality furnace filters, at reasonable price. Delivered to your house