A __________ shall be installed to prevent rain from entering the vent system.

A vent cap is specifically designed to be installed at the top of vent pipes to prevent rainwater and other debris from entering the vent system. This is crucial for maintaining the integrity and functionality of the ventilation system, as water intrusion can cause rust, corrosion, and other damage that may hinder proper airflow or lead to dangerous situations like backdrafting.

In addition to blocking rain, a vent cap can also minimize the risk of animal entry and reduce wind-driven downdrafts that could disrupt the venting process. Its design typically includes features that allow for efficient venting while still providing protection against the elements. Understanding the role of a vent cap highlights its importance in the overall performance and durability of mechanical vent systems.