Drain lines under coils must be installed on an incline and include a bend (trap) to prevent water from flowing backward and air from being sucked in; water condensing from the air on cooling coils drains through these lines into the building's drainage system.

normativepending

Speaker

Unidentified Speaker — Fundamentals of HVAC - Basics of HVAC [klggop60vlM]

Evidence Quote

[underneath] the coils, you're probably going to find that there is drain and drain lines coming out... they're going to look a bit like this with the drains coming out and You go into you bend there to stop the flow coming back And that just comes down this pipe which is on an incline and heads down to the drain

Source

Fundamentals of HVAC - Basics of HVACThe Engineering Mindset
Created: 8/13/2026, 4:57:53 AM

My Notes

Loading notes...