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Window fall protection shall be provided in accordance with Sections R312.2.1 and R312.2.2.
R312.2.1 Window Opening Height
In dwelling units, where the bottom of the clear opening of an operable window opening is located less than 24 inches (610 mm) above the finished floor and greater than 72 inches (1829 mm) above the finished grade or other surface below on the exterior of the building, the operable window shall comply with one of the following:
  1. Operable window openings will not allow a 4-inch-diameter (102 mm) sphere to pass through where the openings are in their largest opened position.
  2. Operable windows are provided with window opening control devices or fall prevention devices that comply with ASTM F2090.
R312.2.2 Emergency Escape and Rescue Openings
Where an operable window serves as an emergency escape and rescue opening, a window opening control device or fall prevention device, after operation to release the control device or fall prevention device allowing the window to fully open, shall not reduce the net clear opening area of the window unit to less than the area required by Sections R310.2.1 and R310.2.2.

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