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The Lennox 93W87 (103614-12) is a genuine OEM pressure switch rated at 0.60" water column, designed to monitor inducer draft pressure and verify proper venting before allowing your Lennox furnace to proceed through its ignition sequence. A failed pressure switch can cause your furnace to lockout, fail to ignite, or display error codes related to draft or venting faults. This exact OEM replacement guarantees proper fit and safe, reliable operation in compatible Lennox heating systems.