Chain Drive Garage Door Openers Installation Lengths Chain Drive Openers Rail Length (Inches) Single Light 128 152 Dual Light(Front and Back) 116 128 Click to see full answer. Accordingly, how far back does a garage door opener go?I typically go three feet back from the end of the open door, which is normally 10′ from the outside wall. In your case I would place it centered directly above the opener. The cord should reach. can you shorten a garage door opener? It is possible to shorten garage door rails, chains, belts, or screws because of space constraints. For example: A standard opener will open a door from 7 to 7-1/2 feet. If you cut 6 inches from the rail, the door will only open 6-1/2 to 7 feet. Likewise, people ask, how do you measure a garage door opener? How to Measure a Garage Door Step 1: Measure the width of the opening at the widest point. Step 2: Measure the height of the opening at the highest point. Step 3: Measure the width of the areas beside the openings. Step 4: Measure the area between the top of the door opening and the ceiling (or to the lowest obstruction at ceiling). Can you use an extension cord with a garage door opener?All garage door openers only come with 2′ cords. He is 100 % correct, no extension cord can be used for permanent wiring. Maybe it’s indefinitely temporary. 400.8 prohibits the use of flexible cords and cables as a substitute for fixed wiring for the structure or where concealed behind walls.

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