Recent 36++ 28 Inch Bifold Door. Order by finished opening size in 1/4 inch increments step 1: Buy internal bifold doors and get the best deals at the lowest prices on ebay! A wide variety of 28 inch there are 4 suppliers who sells 28 inch bifold door on alibaba.com, mainly located in asia. The majority of bifold doors are 80 inches tall. 28 Inch Bifold Door - Masonite Traditional 28 In X 80 In Moonglow 6 Panel Hollow Core Prefinished Molded Composite Right Hand Inswing Outswing Single Prehung Interior Door In The Prehung Interior Doors Department At Lowes Com The distance from the corner of your clear opening to the top of header for the bifold door.