Draft stabiliser made of galvanised sheet steel with flap. The flap is set by means of a rotary knob acting on a weight for precise adjustment. Depending on the adjustment of the weight, the flap admits more or less secondary air into the chimney when the vacuum gets too high.
The natural chimney draft is approx. 20 to 50 Pa, depending on the height and the cross section of the chimney as well as the weather conditions. These values increase when the temperature increases. The draft stabiliser allows for setting the vacuum required by the manufacturer of the heating system (oil or gas burner/boiler combination, oil or gas furnace, etc.) and keeps this vacuum almost constant. Correct chimney draft is a prerequisite for an optimum combustion process and contributes to a reduction in heating costs.
The draft stabiliser performs the following functions:
It limits the vacuum to the required value.It keeps the chimney dry and prevents soot deposits.
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<b>Legend:</b>
<ol>
<li>"Chimney connection" always above flue connection</li>
<li>"Flue gas connection" with pipe connection piece</li>
</ol>
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