“A dry riser inlet and outlet box are components of a fire protection system commonly used in multi-story buildings. The purpose of a dry riser system is to provide a means for firefighters to access pressurized water on various floors during firefighting operations. It is an essential part of the building’s fire safety infrastructure.

Here’s a brief explanation of the dry riser system and the inlet and outlet boxes:

Dry Riser System:
A dry riser is a vertical pipe or duct that runs through the building, connecting different levels from the ground floor up to the top floor. Unlike a wet riser, which is filled with water at all times, a dry riser is normally empty and only charged with water by firefighters when needed during an emergency.

Inlet Box:
The inlet box, also known as the dry riser inlet breeching, is usually located on the ground floor or the entrance level of the building. It serves as the main connection point for fire engines to pump water into the dry riser system. The inlet box has a large diameter connection, typically equipped with a landing valve, which allows firefighters to attach hoses and deliver water into the riser.

Outlet Box:
The outlet box, also known as the dry riser outlet breeching, is positioned on each floor of the building, typically located in stairwells or designated fire escape routes. These outlet boxes serve as access points for firefighters to connect their hoses to the dry riser system on the respective floors. Each outlet box contains a smaller diameter valve or coupling, allowing firefighters to access the pressurized water supply during firefighting operations.

During a fire emergency, firefighters can connect hoses to the outlet boxes on the required floor, and water is pumped from the fire engine into the inlet box on the ground floor, filling the dry riser system with pressurized water. This pressurized water can then be utilized by firefighters to suppress the fire and protect the building’s occupants.

It is crucial to ensure that dry riser systems are well-maintained and regularly inspected to ensure they function correctly when needed in an emergency. These systems are typically designed and installed in accordance with local building codes and fire safety regulations.”