Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Number of Openings

Most elevators feature doors on one side of the car. Some applications will require two sets of doors - front and rear doors. On floors where both sets of doors open, the time the car remains at that floor is diminished since passengers may disembark more rapidly.

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