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The Lennox 69W56 is a genuine OEM 2-stage pressure switch rated at .25/.60 inches of water column, designed to verify proper inducer draft before allowing ignition in Lennox gas furnaces. This safety switch prevents the furnace from firing if adequate negative pressure is not established, protecting the system from unsafe combustion conditions. If your Lennox furnace is failing to ignite, short-cycling, or displaying a pressure switch fault code, the 69W56 may need replacement.