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Checking gas pressure of your furnace with digital manometer.
Uei EM201B (uses about a quarter pound of pressure)
adjusting gas pressure, also discuss combustion analysis
Make sure to shut off your system before you disconnect the hose so you don't blow gas into your open flame! Safety first
Reinstall your plug and close it up.
UEi EM201B Differential Pressure Manometer is a ruggedly designed manometer that is an intuitive digital alternative to taking "U-Tube" pressure measurements. UEi EM201B upgrades the original EM201 by adding Pascals to the unit options and allowing the Min/Max to be reset at any time as opposed to on start-up only.