The warm air blower's off-delay timing is used for the fan shutting off once the burners shut off. There are usually four configurations for DIP switches in letting the fan have a 60-100-140or 180- second on-time period after the burners shut off to cool down the heat exchanger. Integrated furnace controllers often have non-adjustable blower fix timing periods for both on and off delays.

What is meant by the warm air blower's off-delay timing?

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