Disappointed in the number of pleats in the 2" filters. upgraded from 1" to get more surface area. Haven't don the math yet, but will, but I am pretty sure the 1" filters I have been buying have more surface area. Other than that I saw no issues. Haven't used yet.
Made a filter box with 4 merv 13 filters. Have a 20 box fan installed on top. This set up is in my basement on a timer. Really improved the air quality. Thank you for making such great filters and the shipping is amazingly fast.
Duponts 9600 filter has stronger paperboard surrounding the structure which makes it more stiff than yours. Your boards tensile strength is not as good