Customer reviews from Filterbuy
Filterbuy - 21x21x4 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Blue
Average customer rating
4.1
(1,155 Reviews)
Rating breakdown 1,155 reviews
5 Stars
716
4 Stars
109
3 Stars
127
2 Stars
88
1 Star
115
Customer Reviews for Filterbuy - 21x21x4 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Blue
Customer Rating
4
Up until now have been
on August 4, 2025
Posted by: Anonymous
Up until now have been using MERV 8. With the smoke from Canada decided to upgrade to the13 and found price sizing and were all I could ask for .What at this point I do not know and my furnace supplier could or would not say is if I would have enough pressure drop to negatively affect my furnace out performance.Am hoping the four inch pleated will do the job. Have just put in and seem to have at least a happy wife.
Written by a customer while visiting Filterbuy
Customer Rating
5
Once I figured out that
on August 1, 2025
Posted by: Anonymous
Once I figured out that the size of your filters is not the actual size of your filters I returned them and got the correct size to fit my system
Written by a customer while visiting Filterbuy
Customer Rating
5
HAPPY CUSTOMER
on July 26, 2025
Posted by: ORVILLE W.
SINCE WE STARTED USING THE MERV 13 FILTERS, WE'VE NOTICED AN IMPROVEMENT IN HOW CLEAN THE AIR INSIDE THE HOUSE.
Written by a customer while visiting Filterbuy
Customer Rating
4
It is a Good product
on July 24, 2025
Posted by: Norma P.
It is a Good productIt is slightly larger than the original therefore I will not be ordering. Thank you
Written by a customer while visiting Filterbuy
Customer Rating
5
Large filters
on July 22, 2025
Posted by: Kent K.
Great quality & price. Will continue to buy from them.
Written by a customer while visiting Filterbuy
Customer Rating
2
Actual dimensions of the filters
on July 21, 2025
Posted by: Eric R.
Actual dimensions of the filters received were smaller than 16x20x4 and did not fit snuggly in the filter compartment.
Written by a customer while visiting Filterbuy
Customer Rating
4
Dont know why , but
on July 20, 2025
Posted by: Anonymous
Dont know why , but each filter used to be individually wrapped, now none are. Just wondering , other than that all is good.
Written by a customer while visiting Filterbuy
Customer Rating
5
Filters
on July 19, 2025
Posted by: Anonymous
We have used the filters and they are working great.
Written by a customer while visiting Filterbuy