Chamberlain Group (CGI), the corporate parent company to LiftMaster, Chamberlain, Merlin and Grifco, is a global leader in access solutions and products. Read our story. Installation takes 2+ hours, depending on your … Browse garage door openers with the latest security and technology features, then use our helpful videos and support guides to help with your installation. SHOP ALL OPENERS . Align the opener’s rail with the center of the garage door. Then set the opener on a ladder where you’re going to install it. We design and engineer residential garage door openers, commercial door operators and gate entry systems. Follow the manufacturer’s instructions to assemble the opener and mount the rail to the header bracket above the door. GET THE JOB DONE . TIME . CHAMBERLAIN GARAGE DOOR OPENER INSTALLATION. HELPFUL INFORMATION FOR YOUR GARAGE DOOR OPENER INSTALLATION . Place the opener on a ladder and use scrap lumber to get it at the height you need.