Air duct damper-- there will be a variety of connection methods during the installation of the fresh , the common ones are the collar connection and the flange connection

Air-- as a regulating in ventilation, air conditioning, and air purification systems

Duct volume damper-- note:this damper does not have a seal its for air balancing, not air termination.typical uses are for rooms that get minimal use and can be closed off for extended periods of time or rooms that need different amounts of airflow in the summer and winter. you can easily use this damper with vent system hvac parts

Manual air duct main features are flexible operation, low noise, small leakage, wide operating temperature range, reliable structure, safety and convenience

Volume damper-- it is generally used in air conditioning and ventilation system to adjust the air volume of branch , and can also be used for the mixing adjustment of fresh air and return air