Which dimension must not exceed 3 feet for closets that do not require fire sprinklers?

The dimension that must not exceed 3 feet for closets that do not require fire sprinklers is the width. This requirement is outlined in the International Residential Code (IRC) to ensure that closets are not excessively wide, which could create safety issues, such as access and egress challenges during emergencies.

In residential designs, particularly in areas where fire sprinklers are not present, maintaining a maximum width helps to encourage better access in case of an emergency, such as a fire. Wider closets could potentially contribute to difficulties in quickly exiting the space or accessing other areas of the home during a crisis.

The other dimensions, height and depth, do not have a specified restriction of 3 feet in this context, as they may support different design aesthetics and functional requirements without compromising safety. The overall structure and emergency access are prioritized, ensuring that these guidelines promote safety in residential environments where sprinklers are not a requirement.