FAQ

A good draught is crucial for efficient combustion. Under normal conditions, a draft of 10-20 Pa is ideal. The chimney itself provides the draft, not the fireplace appliance. The following factors affect draft:

• Chimney height: A taller chimney attracts more air. If the draft is not sufficient, raising the chimney can help.
• Diameter: The diameter of the chimney should never be smaller than that of your fireplace's exhaust connection. Reducing is allowed only if you follow the proper tables.
• Bends in the pipe: The use of bends reduces draft. If they are necessary, use 45° bends and add 1 meter of flue per change of direction with 2 45° bends each time.
• Combustion air supply: Adequate air supply is essential for proper draft. An open fireplace consumes about 300 m³ of air per hour, while a closed fireplace requires about 30 m³. Fans or exhaust hoods in the home can take away air and cause smoke backlash. This happens when insufficient air goes to the fireplace, which can cause smoke in the room.
• Wind and environmental influences: Draft can be disturbed by obstacles such as tall trees, buildings or cliffs. This can be solved by raising the chimney or installing an exhaust fan. A draft regulator can also help maintain a stable draft.

Draft is simply the rise of warm air in the chimney. The higher the temperature, the stronger the draft. You get the best results when the height and diameter of the chimney are properly matched to the fireplace. If the draft is too strong, heat can be dissipated too quickly. This can be adjusted with check valves, draft regulators or restrictors in the pipe or chimney.