The LF series comprises economical face-mount hangers ideal for applications not requiring web stiffeners. The height of the LF is designed to support the top flange of the I-joist. This feature not only reduces installation time, but also lowers material costs. LF Face-Mount Joist Hanger for 2-1/2 in. x 9-1/2 in. Engineered Wood (Pack of 1800).