OEM Goodman Vertical Drain Pan 23 x 20 in. for WAHMS3642P4ACA — B1756020L

Goodman B1756020L Vertical Drain Pan (23 x 20 in. OD)

The Goodman B1756020L is a genuine OEM vertical condensate drain pan measuring 23 x 20 inches outside dimension, designed for the WAHMS3642P4ACA air handler installed in the upflow/vertical orientation. The pan collects condensate dripping off the evaporator coil and channels it to the drain connection. Cracked, rusted, or algae-clogged pans cause water overflow, ceiling stains, and water damage — replacing the pan with the correct OEM part restores reliable drainage.

Specifications

• Outside dimensions: 23 in. x 20 in.
• Orientation: Vertical (upflow)
• Function: Primary condensate collection pan
• Fits: WAHMS3642P4ACA and compatible air handlers
• OEM Part Number: B1756020L
• Equipment: Goodman Air Handler

OEM vs. Generic

This genuine OEM pan matches the coil footprint and drain port location exactly, ensuring proper slope and a leak-free seal. Generic pans often misalign the drain outlet, leading to standing water and overflow. For water-handling components, exact fit matters.

Installation Difficulty

Moderate — requires partial coil/blower removal to access and slide out the old pan, then reconnecting the condensate drain line and confirming proper slope. Plan 45–60 minutes. Test drainage with water before closing the unit.