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Commercial doors are prepped for locks with the lever or knob height at

40 5/16" above the finished floor (AFF). One commercial door company height is 38"AFF. At no time can you have the lever or knob more than 48" AFF. It will not meet the ADA requirements if it is that high.

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14y ago

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15y ago

Standard diameter is 2", but may vary from 1 3/4" - 2 1/4".

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Wiki User

14y ago

6 inches above the existing knob.

or between 41" and 48" above the floor.

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