How To Measure Garage Door Belt. For best results, the inside of the garage door opening should be framed with 2 x 6 wood. Then, measure outward from the header wall towards the back of the garage using the measurement obtained from the chart.
Device that closes the door. Tighten inner nut to secure the adjustment. Using a tape measure, measure the spring in its unwound state to measure the length of the spring (to the nearest half of an inch).
The garage door rails are also to be installed in the headroom.
For best results, the inside of the garage door opening should be framed with 2 x 6 wood. Device that closes the door. This is a very important measurement that determines if you will need an extension kit when purchasing your diy operator. The full product line includes residential garage door openers and related garage and home accessories.