"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"