How to open fireplace flue. How to open a damper if you have a wood burning fireplace you have a damper that controls how much air goes out the chimney during a fire. Ceiling to floor metal fireplaces have a metal latch located on either side of the fireplace that allows for easy testing of the flue. If there is a burst of cold air the flue is open.
A fireplace flue damper enables you to control how much air flows up your homes chimney when the fireplace is in use. See a diagram of the parts of a chimney here when the damper is closed it slows the loss of heat that would otherwise go up the chimney. A throat damper is a metal door located above the firebox but below the flue pipe.
Adjusting the damper helps you burn a fire safely and efficiently.