Friedrich Lateral Duct Adapter With 4' Extension, attaches to the Friedrich PTAC/PTHP unit to direct up to 35% of the total airflow to a second room. The unit-mounted duct plenum features a front-mounted aluminum grille that has two positions to provide the most optimal air direction. The air may be directed to either the left or the right of the unit through the supplied 3.5H x 7W x 47L plenum. Plenum may be cut to length by the installer. Kit includes duct plenum, front grille, 47 duct extension, duct discharge grille, duct end cap and all necessary mounting hardware.