Fireplace flue open or closed. This duct within your chimney includes a damper that can be opened or closed by a lever or pull chains in most instances. A fireplace flue damper enables you to control how much air flows up your homes chimney when the fireplace is in use. The flue is essentially a channel inside the chimney the smoke is funneled through and its controlled by the damper a pair of small steel doors.
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 flue directs smoke outside of a home when a fireplace is in use. First though you choose whether to buy logs that require a vent for the gas byproducts or logs that allow you to burn them without a vent.
No way to adjust the thing. Historically the term flue meant the chimney itself. Adjusting the damper allows you to burn a fire efficiently and safely.
It blocks off the air flow when its closed and lets air in when its open. Ceiling to floor metal fireplaces have a metal latch located on either side of the fireplace that allows for easy testing of the flue. Air can flow both ways so outside air can come into your home and the heated air from your home can escape through an open damper.
A flue is a duct pipe or opening in a chimney for conveying exhaust gases from a fireplace furnace water heater boiler or generator to the outdoors. Some fireplaces especially prefab types the damper can only be open or closed. If there is a burst of cold air the flue is open.
Now some fireplace including some masonry and some prefab types you can adjust the damper during the burning of a fire. When you convert a wood burning fireplace to gas you get to choose the style of your new gas logs and the pattern of the flame.