I have not had opportunity to use my first filter but it is assuring to me as a widow to have these on hand for home function and maintenance. This is especially true during the harsh winter months.
We modified our filter opening from 1 to 4. We could only open it to 3. 7, and this filter fit perfectly, plus we did not want to go high than Merv 8, to put less strain on our fan, and again the filter was perfect, and was at our door 24 hours after ordering.