Will wood burner backdraft if the flue been fire cemented?

Yes, even with the flue fire cemented, a wood burner can still backdraft. It may reduce the chances of backdrafting, ensuring a good draft is essential for the safe and efficient operation of a wood-burning stove. Several factors can affect the draft, including the height and condition of the chimney, the type of fuel used, and the weather conditions.

For example, here are a few scenarios where backdrafting could still occur even if the flue has been fire cemented:

- Poor Chimney Design: If the chimney is too short, has too many bends or obstructions, or is not adequately insulated, it can hinder proper airflow and increase the risk of backdrafting.

- Negative Pressure: Strong winds or nearby buildings can create negative pressure around the chimney, causing the exhaust gasses to be pulled back into the room instead of being expelled.

- Incorrect Fuel: Using wet, unseasoned wood or burning trash or plastics can produce excessive amounts of smoke and tar, which can build up in the chimney and obstruct the airflow, leading to backdrafting.

- Weather Conditions: Certain weather conditions, such as strong gusts or changes in atmospheric pressure, can affect the draft and cause the wood burner to backdraft.

Therefore, it's crucial to ensure that your wood burner system is properly designed, maintained, and operated according to the manufacturer's guidelines to minimize the risk of backdrafting. This may include regular chimney cleaning, using dry seasoned wood, and addressing any issues with chimney height or design that could impair proper airflow.