For finished ceilings, attach angle iron along the bottom of a joist with 3-in. Hang the opener utilizing two extra lengths of angle iron and nuts and bolts. Use lock washers or thread-locking adhesive to maintain vibration from loosening the nuts. Your directions most likely don’t cover checking the opening force. The “resistance” could be your finger caught within the observe. Angle iron provides a stronger installation and reduces vibration, which helps prolong the opener’s life span. In an unfinished storage, connect the angle iron directly to the face of a joist with 1-in. The Benefits