PREPARATION Before beginning assembly of product, make sure all parts are present. Compare parts with package contents list and hardware contents list. If any part is missing or damaged, do not attempt to assemble the product. Estimated Assembly Time: 20 minutes. 1. Install the expanded rubber particles (E) in the wall, and fix the mounting bracket (B) to the outlet box with machine screws (C) and self tapping screws (D). 2.