Multiple uses of flue pipe elbows reduce the draft. Too strong a draft can be regulated with a damper, draft regulators (flue pipes or chimneys), or restrictors. Too strong a draft can cause the heat to be sucked too fast into the chimney. A good result is achieved when the height and diameter of the chimney fits the appliance. Draft is simply hot air rising High temperature creates strong chimney draft. A draft regulator stabilizes the chimney draft. In extreme situations an exhaust fan must be installed. The problem can normally be solved by making the chimney taller. Influence of the wind Draft disturbance can be caused by tall trees, cliffs or tall buildings. Outside air leading directly to the appliance avoids insufficient combustion air. Negative chimney draft causes smoke in the room. A kitchen duct /ventilator sucks much more air than a chimney. Combustion air is essential for the draft An open fireplace requires approx 300m3 air each hr, while a “closed” fireplace requires approx 30m3 per hr.
#FIREPLACE DRAFT CONTROL INSTALL#
If elbows are used it is better to install with 2 X 45 degrees. Use of flue pipe elbows reduces the draft. A circular chimney liner normally gives a better draft than a square. The chimney diameter should never be less than the diameter on the appliance flue outlet.
If the draft is insufficient it can be a solution to build a taller chimney. Essential for the draft is the construction of the chimney A tall chimney gives more draft. The chimney creates the draft, not the appliance.
We consider a normally good draft to be between 10-20 Pa (1-2 mm VC). A good draft is vital for a good combustion. Chimneys and Draft conditions: The main function of a chimney is to create draft for combustion and to transport the flue gases out of the building.
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