Manufacturer page.

Product name: Pemko Acoustic Automatic Door Bottom Product characteristic: Automatic Door Bottom The Pemko PDB-Series Acoustic Automatic Door Bottom creates uniform seal pressure across the entire door bottom resulting in superior acoustic performance. Addtional features include: - Durable, high quality PemkoPrene gasket - Designed to have a maximum drop of 0.5 - Sealed-in-place type performance on certain STC openings - Fire Rated - Smoke Rated - GREENGUARD Gold Certified - Operates with 5lbs of force or less - Patented design - United States Patent No. 8,925,250 B2 - Product contains several small screws for installation, as well as paper instructions. Otherwise, no other accessory materials are required for installation or use.