This is a safety rule
The 3/4”x 4” Rule for elevator landings is an important section in the safety governing code for home elevators – ASME A17.1 Part 5.3 – Private Residence. 3/4″ of an inch is the maximum distance permitted between the backside of the closed hoistway door at the elevator landing and the edge of the threshold at that floor landing. Four inches is the maximum distance permitted between the backside of the closed hoistway door at the elevator landing and the elevator car gate. This is commonly achieved by the use of a door stop that is ½” or less on a recessed door.
Residential Elevators wants to make sure you have the safest elevator in your home for you, your family and guests. Residential Elevators offers a variety of hoistway door and car gate/door packages to provide you the best level of safety within the home elevator industry.
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