Collar Damper
One form of damper that is frequently used in HVAC (heating, ventilation, and air conditioning) systems to regulate airflow within ductwork is the collar damper. Here is a summary of its attributes and capabilities:
https://truestarairsystems.com..../index.php/collar-da
![image](https://connectgalaxy.com/upload/photos/2024/06/PJ4zuzNKEDpJJzLTuFAY_13_47f5cff75ab663e0b0bc4fdb3fc989f8_image.png)