Another one from the geniuses (heavy sarcasm) at Ask! Although the question said how to adjust a fireplace flue the actual question asked was “What is a fireplace flue?”.
Well, a fireplace flue is the vent that takes the smoke and the fumes and chemical byproducts of burning wood or burning gas out of our homes and into the atmosphere. This is often called a chimney but the flue is the metal ventilation that is installed up through the chimney bricks.
The galvanized steel metal piping line the actual ventilation area for the smoke and fumes so the metal can be cleaned and removed or replaced if necessary. Because a galvanized metal is easier to clean and a brick opening inside a chimney practically impossible to clean the metal flue runs through the chimney. Having the ability to clean the chimney can be essential if the fireplace is burning wood because build-ups of creosote – a by product of burning wood — will eventually become flammable and a small chimney fire is enough to destroy a home.
Ok, so regarding the question of “what is a fireplace flue?” the answer is ridiculous but now we at Majestic Grill Parts have cleared that up for you. The other question as it was posted on the site was “How to adjust a fireplace flue” and that does not make a lot of sense.
A fireplace flue does not have anything to be adjusted other than the pipe height and the pipes are designed to fit together inside a brick chimney or alone (called a chase vent).
Adjusting a flue could refer to adjusting the damper. The damper is the adjustment made inside the house that allows more or less of an opening in the flue. The damoer should be at the base of the flue right above the fireplace opening and have a swing-arm at the front of the fireplace just within and above the top of the fireplace opening. When a fireplace is not in use the damper should be kept closed so heat or air conditioning does not get pulled out through the chimney. Also the damper is often opened completely when the fireplace is in use so the pull is working at full strength. Often we may close the damper slightly to allow fumes to be pulled out while slowing down the pull enough for heat to flow into the house.
In a retro-fitted damper the damper is installed in the top of the flue and is tilted open or closed using chains that hand down through the flue and come through with handles on the about mid-way down the chimney.
That is the only thing adjustable I can think of in a completed flue pipe chimney for a gas or wood burning fireplace,