I have an odd shaped heat exchanger and It is great that filterbuy can do specific sizes with many customization options. It is all online and you dont need to call them or send emails etc.However I still believe there is a room for price improvement. (Cut one star due to price)
What a HUGE relief to find the EXACT size filter needed for an old school type furnace. AND even better, I was able to get the highest MERV rating my furnace can use to help clean the air in my home. During cold, flu & Covid season an extra little bit of peace of mind.