How does a modulating gas burner adjust the fuel mixture?

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gypsydoctor

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My new Burnham Alpine gas boiler uses a variable speed blower to modulate the flame output down to 1% increments. How does it adjust the gas flow to keep the proper fuel/air mixture at all flow rates?

An old car does this with a carburetor. A new car has a mass air flow detector feeding a computer which meters the fuel injectors.
 
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Hey, wait a minute.

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