Commercial Door Operators are complex systems, designed to integrate with a wide variety of door types, functions, and situations. In addition to the style of door (Standard Sectional, Rolling Steel, etc.) the size and weight of the door as well as the number of cycles it is expected to perform both hourly and daily determine what type of operator and what size motor are required. As a result, you should contact a professional installer of LiftMaster products to assist in the selection of an operator.