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AHU Drain-Pan Design: Slope, Trap Depth and Overflow Protection

In an Air Handling Unit (AHU), the cooling coil removes both sensible and latent heat from the air. During this process, moisture in the air condenses on the coil surface and falls into the drain pan. From there, condensate must be collected, drained, trapped, and discharged safely.


A poorly designed AHU drain-pan system can cause serious operational problems, including:

  • Water carryover into ductwork

  • Leakage inside plantrooms or ceiling spaces

  • Corrosion of AHU casing and coil frames

  • Microbial growth and bad odor

  • False ceiling damage

  • Fan section water accumulation

  • Negative pressure preventing drainage

  • Overflow during high humidity operation


Drain-pan design may look simple, but it is one of the most common causes of AHU maintenance complaints. Proper design requires correct pan slope, adequate drain connection, proper trap depth, overflow protection, and maintenance access. (AHU Drain-Pan Design: Slope Trap Depth and Overflow Protection)

AHU drain-pan design

Download the full design guide PDF with detailed calculations, sizing, code compliance, and real project insights.  (AHU Drain-Pan Design: Slope Trap Depth and Overflow Protection)




For detailed calculations, project-specific design, and authority-compliant solutions, contact our engineering team.

Phone : +94 76 720 5408

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