A commercial door installer is responsible for the installation of doors for companies and commercial properties. Your responsibilities in this career are to install a variety of door types, such as wood doors, metal doors, sectional doors, and hinged doors. You should be well versed in the different fitting techniques for the different styles of doors and frames. Additionally, your duties as a commercial door installer may involve more mechanical installations, such as overhead doors or mechanical gates. For these industrial doors, you need to install the hardware for the gate operators. You may also be called to perform repairs on the installed doors.