There is a one inch gap according to official documentation. According to the manual:
Quote:
The Sally Port is a door ¼” thick, 4 ft. wide, 2 ft. tall that can only swing toward the NEUTRAL
ZONE. The opening is 3 ft. 6 in. wide. The top of the door is 2 ft. 1 in. from the surface of the
platform.
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If the top of the door is 2 feet 1 inch from the platform and the door is 2 feet high. Simple subtraction will show a one inch gap.