There are also mechanical air flow gauges that sense pressure changes.
Furnace air flow sensor.
Royalton 66000 max btu input natural gas 95 percentage upflow horizontal variable speed 2 stage forced air furnace.
The filterscan wifi home affordable airflow sensor and differential pressure monitor sends you a text or email when it s time to change your home s air furnace filter.
The premise here is that as the filter fills up with contaminants the differential air pressure in.
The furnace s computer uses the signal from the flame sensor to confirm a successful ignition and turn off the igniter.
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Most high efficiency furnaces use a hot surface igniter that heats up to 1 800 degrees f to light the burners.
Follow the instructions in your owner s manual to change the air filter.
The furnace draws air from the surrounding area or from outside the room.
Make sure that the gas supply valve for your furnace is fully open.
The furnace must have proper airflow through the burner in order to continue running.
If the furnace is located in a utility closet or in a cramped storage room there may not be sufficient available air for the furnace to heat properly.
Replace the air filter in your goodman furnace regularly to keep dust and dirt from clogging the filter and blocking air flow through the furnace.
Gas supply shut off.
During combustion the combustion blower creates an air pressure that is less than atmospheric negative pressure between the inlet side.