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Checking furnace gas pressure: inlet tap, outlet (manifold) tap and regulator

Gas piping with a manual shutoff and sediment trap feeding a furnace gas valve. A manometer on the inlet tap reads supply pressure; a manometer on the outlet tap reads manifold pressure going to the burner orifices. The regulator adjustment is under a cap on the valve.

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Guides that use this diagram

How to Check Furnace Gas Pressure: Inlet and Manifold with a Manometer

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