Adjustable Extension Column Adjustable extension pipe Designed for use with Epson PowerLite 400W Multimedia Projectors Adds between 8-Inch and 11-Inch of length The range is 8-11 inches, selectable in 4 increments. . Adjustable Height: 6 inch to 9 inch The Epson ELPMBC01 Adjustable Extension Column is designed to offer variable distance between projector mount and the ceiling.