For systems with flue gases, what does the draft rely on?

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For systems with flue gases, the draft is primarily a function of the weight differences of the gases involved, as it refers to the movement of air and combustion gases through the chimney or flue. The concept of draft relies on the principle that warmer, lighter gases rise, creating a pressure difference compared to the cooler, heavier outside air. This difference in weight leads to an upward movement of the flue gases, which helps in exhausting the combustion products effectively from the system.

While temperature differences can influence the draft by affecting the density of the gases, it is ultimately the weight of the gases, the lighter warm gases versus the heavier cool air, that creates the necessary force for the draft to function properly. Other factors such as pipe size and flow rate do play a supporting role in the efficiency of a venting system but are not the primary elements that create the draft itself.

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