What is the required size for class 1 and 3 standpipes that are more than 100 feet?

For class 1 and class 3 standpipes that are utilized in buildings where the distance exceeds 100 feet, the required diameter is specified to be a minimum of 6 inches. This size is crucial as it allows for adequate water flow and pressure necessary to effectively combat fires and ensure safety during an emergency.

Standpipes are part of a building's firefighting system, providing firefighters with a means to access water in various locations throughout the structure. The 6-inch diameter facilitates the delivery of a sufficient volume of water to effectively manage larger fires, particularly in taller buildings where reach and pressure can be pivotal in controlling or extinguishing flames.

In this context, while smaller diameters (such as 4 or 5 inches) may suffice in certain scenarios, they do not meet the requirements for standpipes exceeding 100 feet, where increased flow is necessary. Hence, the adoption of a 6-inch diameter standard is implemented to ensure public safety and compliance with fire safety regulations.