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What is the design requirement for flue dampers in the passage of flue gases?

They can completely shut off flue gases

They should facilitate flue gas emission

They cannot completely shut off the passage of flue gases

The design requirement for flue dampers concerning the passage of flue gases is that they cannot completely shut off the passage of flue gases. This is essential for ensuring that there is always some level of gas flow to prevent backpressure and allow for proper venting of exhaust gases. If flue dampers were able to completely shut off the flue gases, it could lead to dangerous conditions such as increased pressure within the system, potential overheating, or even hazardous gas buildup within the boiler or building.

Maintaining a constant flow allows for the safe and effective operation of the boiler system. Flue dampers are primarily designed to modulate the flow of gases to optimize efficiency and maintain safe operating conditions, rather than being a complete block. Therefore, the requirement ensures that dampers can control the flow while still allowing for adequate venting, which is crucial for safety and efficiency in operation.

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They must reduce flue gas pressure

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