flue resistance
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Is there any relationship between the resistance in the boiler’s exhaust flue and the suction force of the exhaust fan and the chimney? It’s not easy to understand. If the smoke entering the bottom of the chimney experiences less resistance, is that better? In that case, does a higher resistance in the flue mean it’s better?
The level of flue gas resistance is not necessarily better when it is higher, nor is it better when it is lower. Regarding the factors affecting flue gas resistance, it can be understood through pressure balance among the three major balance concepts. The exhaust pressure (or, in other words, the flue resistance) is necessary to ensure that the combustion gases burn as thoroughly as possible within the furnace. If this pressure is too low, it indicates that combustion within the furnace is not adequate, which can lead to issues such as excessive emissions; moreover, it increases the energy consumption of the exhaust fan. The same is true in reverse; therefore, each parameter should be within a reasonable range.