What type of makeup air systems must be equipped with closure means?

Makeup air systems are critical for maintaining indoor air quality and pressure balance, particularly in environments with exhaust systems that remove a significant amount of air, such as commercial kitchens or industrial applications. The requirement for certain systems to be equipped with closure means relates to their ability to control air flow and environmental conditions effectively.

Type B makeup air systems are specifically designed to integrate with exhaust hoods and typically require closure mechanisms to manage airflow when the system is not in operation. This is essential for preventing unwanted heat loss or gain, maintaining energy efficiency, and avoiding backdrafts that can compromise indoor air quality.

In contrast, other types of makeup air systems may not necessitate closures due to differences in their design, intended use, or operational requirements. Understanding the specific design and functionality of Type B systems provides insight into the regulatory standards that mandate the inclusion of closure means to ensure safety and efficiency within these mechanical systems.