Pemko 434APKL36 Mill Aluminum automatic door bottom consist of a variety of solutions for sealing a door to the threshold or floor surface. this is one of the product categories with the widest variety of options among the Pemko brand and offers a plethora of solutions finishes duty-levels makes and models. standard duty doors are mostly used in residential applications while the heavy-duty doors are typically used in commercial applications. In addition to provide for traditional doorways slide-rail doors and folding doors. Pemko provides door bottom solutions for automatic doorways as well as enabling a whole other level of doorway solutions.