What is the minimum net clear opening width required for an egress window in a sleeping area?

The minimum net clear opening width required for an egress window in a sleeping area is 20 inches. This requirement is established by building codes to ensure that windows used for egress provide a safe and accessible exit in case of an emergency.

Having a net clear opening width of at least 20 inches allows occupants, including children or those with mobility issues, to exit easily. This size also facilitates the passage of emergency personnel or equipment when responding to a situation, enhancing overall safety in residential design.

To clarify, the other options listed do not meet the required width set forth by the building codes, which ensures that the passage remains adequate for safety purposes. For example, a width of 18 inches falls short of the standard and could pose a risk in an emergency evacuation scenario.