The addition of two bags on an H Frame in the distribution barrier is located in which part of the system?

• A. In belt road
• B. In the face
• C. In the intake
• D. At the surface

Answer: (A)

In ventilation terms, a distribution barrier is used to control how air is split and routed from intake toward the face and then back along the belt road. An H-frame with bags acts as a flow-control and balancing element, so placing the two bags in the belt road puts this control right where the main air streamline travels past the belt entry and into the return path. This location lets you modulate flow and pressure without placing barrier components in the active face or at the air source, and it isn’t appropriate to mount them on the surface. So the two bags on an H Frame are located in the belt road.