You close the damper when you are not using the fireplace too keep air from coming
in and to keep the air from being sucked out. This is most important in the winter.
You don't want cold air coming in and your heat sucked out.
When you are using the fireplace you have to open the damper to allow
the smoke and fumes to escape.
To open a fireplace damper, locate the handle or lever usually located inside the fireplace or on the chimney. Pull or push the handle to open the damper fully, allowing for proper ventilation and airflow in the fireplace.
Virgie ammons invented the fireplace damper in September 30,1975
To open the vent of a fireplace, locate the damper control, which is typically found inside the firebox. This may be a lever, a handle, or a chain that you can pull or push to adjust the damper. If the damper is stuck, gently move it while ensuring the fireplace is cool and not in use. Always ensure the vent is fully open before starting a fire to ensure proper airflow and ventilation.
The flue is the actual pipe or chimney where the damper is the mechanism that opens and closes the flue
If it is a wood burning fireplace- yep.
In most cases, the fireplace damper is open when the chain is up and closed when the chain is down. Pulling the chain up usually opens the damper to allow smoke and gases to escape, while pulling it down closes the damper when the fireplace is not in use.
The position of the damper depends on the specific situation and the type of fireplace or heating system you are using. Generally, the damper should be open when starting a fire to allow smoke and gases to escape, and closed when the fireplace is not in use to prevent heat loss. For wood-burning stoves or fireplaces, adjust the damper to control airflow and optimize burning efficiency. Always refer to the manufacturer's instructions for specific guidelines.
The purpose of the fireplace damper is to keep the outside elements, outside. The damper is opened only when there is a fire in the fireplace.
Shut and Open
fireplace
If you are looking for more information on where can you find info about fireplace flue damper, the best place to look is on www.csia.org/FAQs/tabid/120/Default.aspx
When you use the fireplace, the damper should be open all the way. If not, you probably will not get enough updraft and your house will fill up with smoke...not a good thing. When it is not in use, the damper should be closed...otherwise you will lose a lot of heat up the chimney.