Filterbuy 20x20x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.50 x 19.50 x 0.75 Inches)

They fit perfect and I think they’re doing their job. Super easy to install. It was a great value for the money.

The MERV 13 works great with my residential HVAC system. Air quality and filtration are amazing! Highly recommended!!

Perfect size! Not sure how well it does the job yet but it is sturdy and seems of good quality! Good price also.

Not flimsy. Great weight. Works beautifully and catches everything w ease. Will buy again.

The materials of this 20x25x4 filter seem to be of good quality and filter is made in USA. The filter dimensions are undersized and as a result loosely fits in the furnace track. 19-3/8 x 23-3/8 x 3-5/8. The filter gets sucked out of the frame and does not filter the air. The frame of the filter does not indicate it is a MERV 13: only a removable label. I would like to buy American but improvements need to happen with this filter.

Fits my system like a glove. I’ll be purchasing more. I change out every 90-120 days.

My wife and I struggled for months to source the proper HVAC air filter for our system. A large part of the issue may have been due to the fact that the HVAC hardware in the attic is clearly a Frankenstein situation where previous owners had HVAC techs "rebuild" the whole indoor evaporator mechanism with a bunch of random parts from at least 3-5 different brand names.Anyways, I was tasked with managing this part of the condo once I moved in a few years ago and it was a struggle to figure out how it should be properly set up. After buying several filters of the wrong format/size we finally were able to confirm with an HVAC tech the proper size and proper installation of said filter.These filters are great. The only thing you should be concerned about is how well your HVAC system can handle higher-grade filters. I knew I wanted a HEPA-graded filter (I did my best to vacuum/clean out the ducts at least 2-3 times in the past 5 years), but I didn't realize that it could impact the performance of the HVAC system if it's too high of a grade. The filter an HVAC tech installed when we were trying to figure out why the system wasn't working consistently was almost transparent and clearly did not impede airflow.These filters need to be installed in the right direction (common with any decent filter) and clearly require much more force to push air through them than any super cheap option your HVAC tech might have in their truck. Does having a HEPA-grade filter impact airflow from the vents? Yes. Is it worth it? Yes--assuming your system can handle pushing air through the new bottleneck.Unfortunately, if your HVAC system can't handle moving air through this I think you will be in the market for a new evaporator/internal HVAC component in the near future. I spent hours (in aggregate) researching options for this and coming up with possible fixes that wouldn't require replacing the whole AC unit. We ultimately had to due to the compressor (the part that's outside) failing, but the installers confirmed that the old unit wouldn't have been able to keep up with higher-end filters anyways.TL;DR: Great filters. Only problem is that if your HVAC isn't robust enough to support pushing air through high-grade filters it will prove to you and your family that you need a new system. I still highly recommend these filters but if you're switching from super cheap/no-name filters to this and your system is old... you may be looking at a whole new HVAC setup if it can't handle airflow effectively.

First time trying this brand of filters. I was using 3M filters but they are so expensive. These filters seem to be comparable to and equivalent to the 3M if not better.