The PACHFK1 is designed to support Chief's PAC501 in-wall solution by eliminating the need to install a standard wood header and footer. - Easily installs between three 16" center studs with center stud removed - Reduces PAC501 installation time - All hardware included - Provides a solid support structure, which elimates the need to frame around the PAC501 with 2x4 studs - Provides knockouts for simplified electrical wiring