Customer reviews from Filterbuy
Filterbuy - 21x21x1 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (6-Pack) - Gold
Average customer rating
4.8
(13 Reviews)
Rating breakdown 13 reviews
5 Stars
11
4 Stars
1
3 Stars
1
2 Stars
0
1 Star
0
Customer Reviews for Filterbuy - 21x21x1 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (6-Pack) - Gold
Customer Rating
5
Excellent MERV 11 Custom Filters.
on July 14, 2025
Posted by: Anonymous
I find these air filters to catch the tiniest particles and clean the air. For someone who has allergies and asthma, these filters are a lifesaver.
Written by a customer while visiting Filterbuy
Customer Rating
5
Great Filters
on October 23, 2024
Posted by: Cindi L.
I had no idea I had so much dust in the air until I started using these!!
Written by a customer while visiting Filterbuy
Customer Rating
5
This is perfect filter of
on December 27, 2023
Posted by: Negar G.
This is perfect filter of my homes a/c. Special for the family health
Written by a customer while visiting Filterbuy
Customer Rating
4
It seems to be working
on October 30, 2023
Posted by: Anonymous
It seems to be working as expected. The frame is adequate but could be just a bit more rigid. The quality seems good, but only usage time will tell.
Written by a customer while visiting Filterbuy
Customer Rating
5
Filters
on June 9, 2023
Posted by: Anonymous
Wont buy filters any where else! Not even Amazon!!
Written by a customer while visiting Filterbuy
Customer Rating
5
Finally the correct size filter!
on February 9, 2023
Posted by: Anonymous
My air handler requires a filter that is 21" x 21", but to find that size I would have to pay extra for a "non-standard" size, IF they were available. The website where I purchased my previous filters considered 21" x 21" filters to be a custom size, and they were going to cost me 50% more than what I paid for the 21" x 20" filters that I ended up buying. Enter Filterbuy to the rescue that has legitimate 21" x 21" filters for no extra cost!I haven't actually used any of these filters yet as I still have two filters left from the previous purchase from a website that will remain unnamed. Although I did open the package just to see how they fit. They fit like an air filter should fit, nice and snug with just enough clearance to be able to grab the corners and remove it.The frame is much stiffer than the filters I am currently using, so they don't have the cross flex or what I'll call droop in them like the current filters do. I was able to slide the Filterbuy filter in the channel without having to reach under and push the back of the filter up so it would install correctly. My physical limitations makes it impossible for me to install the other filters without using something long enough to reach under the air handler and then push up on the filter to get the back of it to slide in the rear channel.
Written by a customer while visiting Filterbuy
Customer Rating
3
Seem flimsy
on February 4, 2023
Posted by: Lisette A.
Ive been using filter by for a couple of years now and I just really hope that their product is good because I am depending on them for my AC. Theyve been looking kind of flimsy lately.
Written by a customer while visiting Filterbuy
Customer Rating
5
Box a bit damaged, however
on September 29, 2022
Posted by: Anonymous
Box a bit damaged, however contents were fine. Perfect fit.
Written by a customer while visiting Filterbuy