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The Goodman B1756028L Horizontal Drain Pan is a genuine OEM condensate pan engineered for horizontal-configuration ATUF364216AA air handlers. When an air handler is mounted on its side in an attic or crawlspace, the horizontal pan captures coil condensate and routes it safely to the drain — preventing ceiling stains, overflow, and water damage.
OEM horizontal pans are molded to the factory coil profile with the drain port positioned for correct gravity flow in the side-mounted orientation. Generic pans rarely match the slope or drain location, risking standing water and microbial growth. The B1756028L seats in the original rails for a clean, leak-free fit.
Moderate (3/5). Requires removing the access panel and coil to seat the pan, then re-plumbing the primary (and any secondary) drain line with proper pitch. Confirm the drain trap is clear before reassembly. Disconnect power before servicing.