Card Reader/ Door Intercom Mounting Heights?

There seems to be fairly broad range of accepted mounting heights for door mounted devices like card readers and intercom stations.

A variety of codes define acceptable mounting heights, with the most widely accepted US source being ADA 1995. For example, intercom stations can be mounted as low as 27 inches and as high as 48 inches. That's quite a range!

Do you have a standard height you specify or install to? Where might your specified height vary? Why?

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