Which type of damper is allowed as an aftermarket add-on in residential buildings?

In residential buildings, thermally operated dampers are specifically designed to open and close based on changes in temperature, allowing for more efficient control of airflow and energy use. This type of damper can respond automatically to temperature fluctuations, enhancing comfort within the home and improving the overall HVAC system’s efficiency.

Thermally operated dampers can often be integrated into existing systems without requiring significant modifications, making them suitable as an aftermarket add-on. Their design aims to optimize energy usage by utilizing thermal expansion of materials to activate the damper, thus adapting to the temperature without manual intervention.

Other types of dampers may require more complex installations or mechanical systems, which could complicate their use as aftermarket solutions. For instance, electrical dampers typically involve wiring and control systems that aren't as easily added after initial construction. Manually operated dampers require user intervention to regulate airflow, which might not be as convenient or effective for homeowners seeking automations. Spring-loaded dampers, while useful in certain applications, might not meet the same efficiency standards or offer the desired automated comfort that thermally operated dampers provide.