Been using the 20x25x4 for multiple years now. Filters work great, I replace mine every 90 days in my house. Never had any issues or concerns about quality or construction of the filters. I've seen many complaints about the 1" thick filters and while I understand their concerns; a 1" thick filter is old technology and should consider getting a larger filter box. I find the complaints about the tabs holding the pleats in the filter where you may have to push a few back trivial. You're buying a MERV 11 equivalent disposable filter, again DISPOSABLE. It wasn't long ago when everyone was just using the blue fiberglass air filters.. There is a balance between retail cost and manufacturing cost. If they raised prices to appease everyone, they'd complain the filters are too expensive even though build quality is excellent!. Your Neighbor. Indiana. Thu Dec 22 2022

So far so good... trusted the ratings on this one... time will tell... only used one at this present time... but, there does seem to be some improvement in the air in my home. Dianna. US. Sun Apr 06 2025

Fit is hard to find the right size filters for our furnace....so grateful you had them.. Kathryn. MO. Thu Oct 01 2020

Our top-of-the line filter captures 99.97% of airborne particles from the air passing through the filter media, including dust, allergens, bacteria and viruses. Designed with electrostatic air filtration, the Filtrete Premium Allergen, Bacteria & Virus True HEPA Filter traps particles 1000x smaller than the human eye can see. Say hello to cleaner, fresher indoor air. Filtrete knows your home filtration needs are as unique as you are, that’s why we’ve designed a family of room air purifier filters and devices to fit your lifestyle - from small to large rooms; True HEPA, to Odor Reduction - Filtrete has you covered.

Works better than most filters! Great product ! Love it!. Cs26. Mcminnville, TN. Tue Aug 02 2022

The Mann Hummel MERV 8-rated electrostatically charged medium efficiency air filters offer you the protection needed from airborne particles and contaminants while improving the air quality for your residential or commercial applications. With the MERV 8 extremely low-pressure drop and high dust holding capacity, these filters are great for your utilization to supply your home or business with the air quality you wish for while optimizing the performance and longevity of your HVAC unit. Constructed from a two-piece frame provides rigidity and durability with double-wall thickness around the outer edge. Independently tested and verified for quality control (comparable with MPR 600). 100% synthetic, proprietary media withstands moisture and damage. Rust-resistant, expanded metal support grid made of galvanized steel. Industry-standard suggests to replace filters at least every 3 months