Is the flue damper fully open?
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The opening of the flue baffle in our installation is 30%. When the amount of acid gas is small, it needs to be used to control it, otherwise the pressure will be too low. we learn * This is also the case. Some comrades said that the baffle needs to be fully opened. What is the situation with your door?
Adjusting the flue damper is usually a means to prevent the system pressure from being too low when the load is low, and does not need to be adjusted during normal operation.
The flue baffle is a means of adjusting system pressure. Generally, it is less likely to be fully opened.