How much headroom is required above a commercial or industrial garage door?

There are different lift types for commercial, agricultural or industrial doors. When we talk about a "Standard" lift movement, here are headroom requirements based on the type of hardware:

Note: if you use a trolley-type operator, add 2 ½ inches.

IMPORTANT: do not use a Standard lift movement if you have over 2 ft. (61 cm) of headroom. Use a "High Lift" movement. It is important to leave clear space above the garage door.

For Low Headroom applications, the minimum headroom requirement is this following:

Note: if you use a Trolley type operator, add 2 ½ inches.