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The Goodman B1756028L Horizontal Drain Pan is a genuine OEM condensate pan designed for the WAHMS4961P4AAA air handler when mounted in the horizontal (attic/crawlspace) position. In horizontal installs the pan runs the full length of the coil to catch condensate that would otherwise drip into the cabinet and ductwork. A corroded or split horizontal pan is a leading cause of attic water damage and emergency-switch trips, so a sound pan is essential insurance.
The genuine OEM pan matches the coil length, rail channels, and drain-port location for the horizontal layout, ensuring full coverage and complete drainage. Generic or trimmed-to-fit pans often leave gaps at the coil ends where condensate escapes. For a leak-free horizontal application, the factory pan is the dependable choice.
Difficulty: Moderate (3/5). Requires pulling the horizontal coil slab, swapping the pan, and verifying a continuous slope toward the primary drain. Plan 45–75 minutes. Disconnect power and test the secondary drain/float switch after installation.