Under what condition are Class III standpipes required?

Class III standpipes are specifically required in buildings that are four or more stories in height. This requirement is outlined in the fire codes, which aim to ensure adequate fire protection and facilitate firefighting operations in taller structures.

In buildings with four or more stories, the potential for fires to reach higher levels increases, and having a Class III standpipe system allows firefighters to effectively and efficiently manage the situation. The Class III system combines both a size appropriate for fire department connections (typically 2½-inch outlets) and a smaller outlet for trained personnel to use, which is crucial in situations where they need to provide additional water supply or for firefighting activities.

This requirement is a proactive safety feature, recognized by building codes, ensuring that adequate firefighting resources are available in taller buildings where access and mobility can be more difficult.