The minimum net clear opening height for window egress is specified to be 24 inches, which is equivalent to 2 feet. This requirement is essential for safety, particularly in emergency situations where occupants may need to escape quickly from a building. The height ensures that an average adult can comfortably pass through the window without obstruction.
In addition to the height requirement, there are also minimum width and overall area requirements for egress windows. This holistic approach in design standards helps to ensure that escape routes are both accessible and effective during emergencies.
Using a height of 2 feet as the minimum helps to balance the need for safety with practical considerations regarding building design and window placement, especially in residential homes. This dimension is particularly pertinent as it allows for a variety of window types while still adhering to safety standards.