What are the two types of barometric dampers?

Barometric dampers are essential components in HVAC systems that help regulate the flow of air and maintain proper ventilation. The two types of barometric dampers are categorized based on their mechanism of operation, specifically in relation to how they handle airflow.

Single acting barometric dampers are designed to open in one direction only, which allows air to flow in when there's positive pressure and remain closed when the pressure is negative. This design is beneficial in applications where the airflow only needs to be controlled in one direction, thereby preventing backdrafts.

Double acting barometric dampers, on the other hand, can open in both directions. They adjust to changes in pressure from either side, allowing for both intake and exhaust air management. This versatility makes them suitable for scenarios where two-way airflow is necessary, adapting to varying system demands without restricting air circulation.

This distinction between single acting and double acting functionalities highlights their roles in maintaining system efficiency and indoor air quality, allowing technicians to choose the appropriate type based on specific system requirements.