Cal-Royal Commercial Grade Door Closer, Size 3 The Cal-Royal 430P Commercial Duty Door Closer is a great alternative for use on interior and light weight exterior door applications. Its compact design has the features and appearance of a full size closer but requires less space on a door for installation, and provides complete funtionality for any opening. It is commonly used on projects that specify multiple interior door closers to address job conditions and budget concerns. This Cal-Royal door closer is an excellent choice for hotels, condominiums, apartment complex and single family residences. Level 3 Spring Tension rating. Aluminum alloy shell with aluminum finish. Can be mounted regular arm or Parallel arm. Parallel arm bracket included. Maximum door size 42-Inch interior and 36" Exterior Maximum door weight 143-Pounds. Cal-Royal is a manufacturer of fine door hardware products.