ICC Commercial Mechanical Practice Exam

The purpose of using a drainage pan in HVAC systems is primarily to collect and remove condensation. In many HVAC installations, particularly those involving air conditioning units, condensation occurs when warm, humid air passes over cold coils. This leads to moisture being drawn out of the air, which collects as water in the drainage pan.

The drainage pan serves a critical function by preventing water from accumulating inside the unit or surrounding areas, which could lead to water damage, mold growth, and other moisture-related issues. By directing this excess moisture away from the HVAC system and out of the building, the drainage pan helps maintain both the efficiency of the HVAC system and the overall integrity of the building structure.

Other options do not correlate with the primary function of a drainage pan; regulating temperature, distributing heated air, and filtering airborne contaminants involve different components and systems within HVAC design and operation.