OEM Goodman Horizontal Drain Pan for WAHMS1824P4ACA — B1756021L

The genuine Goodman B1756021L Horizontal Drain Pan is the factory condensate pan for the WAHMS1824P4ACA wall-mount air handler installed in a horizontal orientation. It captures condensate from the indoor coil and directs it to the drain, which is especially important for horizontal and attic installs where leaks can cause ceiling and structural damage.

Specifications

• OEM part number: B1756021L
• Orientation: Horizontal (side-lay / attic) installations
• Fits: Goodman/Amana WAHMS1824P4ACA air handler
• Equipment type: Wall-mount air handler
• Function: Primary condensate collection pan

OEM vs. Generic

The OEM horizontal pan provides the correct drainage slope and drain-port placement for this model, preventing the standing water that causes overflow and microbial growth. Universal pans seldom match the coil and drain geometry exactly. For horizontal installs, where overflow risk is highest, OEM is strongly recommended.

Install difficulty

Moderate — requires accessing the coil, seating the pan in the horizontal position, and reconnecting the drain. Plan 45–60 minutes and verify drainage and a clear secondary/overflow path after install.