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:
|Type||Radius: 12 in.||Radius: 15 in.|
|2 in. Commercial Door height: 8 to 12 ft.||12 in.||n.a.|
|2 in. Commercial Door height: over 12 ft.||13 ½ in.||15 in.|
|3 in. Industrial||n.a.||15 in.|
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:
|Type||Low Headroom Rear installation||Low Headroom Front installation|
|2 in. Commercial Door height: 8 to 12 ft.||4 in.||8 in.|
|2 in. Commercial Door height: over 12 ft.||4 in.||10 in.|
|3 in. Industrial||11 in.||13 in.|
Note: if you use a Trolley type operator, add 2 ½ inches.