4) position the opener, Sectional door & one-piece door with track, One-piece door without track – Chamberlain 1280 - 1/2 HP User Manual

4) position the opener, Sectional door & one-piece door with track, One-piece door without track | Caution, Installation step 4, Position the opener | Chamberlain 1280 - 1/2 HP User Manual | Page 12 / 36