The Universal Hardware Aluminum Medium-Duty Commercial Door Closer is designed for many different commercial door applications. This Medium-Duty Commercial Door Closer is suitable for interior commercial doors ranging from 44 lbs to 188 lbs . The closer is packaged with a parallel arm bracket to allow for Tri-Pack installation.. All metal body construction for added durability. Size 3: works with doors weighing less than 125lbs.. UL Listed: 3-hour fire rated for added protection and meeting building requirements. Interior doors: Left or right hinged doors up to 125 lbs. and 38" wide. Exterior doors: Left or right hinged doors up to 125 lbs. and 30" wide. Adjustable closing and latching speeds eliminate door slamming. Opening range: 180-degree for added convenience and pass-through space. Mounting: Standard, top jamb or parallel mount. Limited 10 year warranty. Commercial / Residential: Commercial. Door Closer Operation: Hydraulic. Interior/Exterior: Exterior. Door Closer Features: Adjustable Closing Speed