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For finished ceilings, connect angle iron along the bottom of a joist with 3-in. Hang the opener using two extra lengths of angle iron and nuts and bolts. Use lock washers or thread-locking adhesive to keep vibration from loosening the nuts. Your instructions most likely don’t cowl checking the opening drive. ” could presumably be your finger caught within the monitor. They require the least maintenance, however they’re not as quiet as belt drives. Belt drives (a rubber belt opens and closes the door) are the quietest, making them the only option if