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Emergency escape and rescue openings shall comply with Sections 1031.3.1 through 1031.3.3.
1031.3.1 Minimum Size
Emergency escape and rescue openings shall have a minimum net clear opening of 5.7 square feet (0.53 m2).
Exception: The minimum net clear opening for grade-floor emergency escape and rescue openings shall be 5 square feet (0.46 m2).
1031.3.2 Minimum Dimensions
The minimum net clear opening height dimension shall be 24 inches (610 mm). The minimum net clear opening width dimension shall be 20 inches (508 mm). The net clear opening dimensions shall be the result of normal operation of the opening.
1031.3.3 Maximum Height From Floor
Emergency escape and rescue openings shall have the bottom of the clear opening not greater than 44 inches (1118 mm) measured from the floor.

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