Automatic Door Opener
One of the greatest inventions of all time! OK, maybe not the greatest, but they sure are nice to have and a big pain if they are not working correctly. When all the other components of a door are working correctly, the opener smoothly and effortlessly opens and closes your overhead door by the simple push of a button. The most popular designs of door openers are chain drives and screw drives. Each have their advantages and disadvantages.