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The minimum depth of an auxiliary drain pan used in secondary drain systems for an air conditioning system is specified to be at least 1 1/2 inches. This depth is crucial because it allows for adequate water collection in the event that the primary drain system becomes clogged or fails, ensuring that any overflow is effectively captured and preventing water damage to the surrounding area.

A drain pan that meets or exceeds this depth is also more reliable in preventing spillage and offers sufficient volume to manage excess water that might accumulate during normal operation. The standard has been established based on functional requirements to maintain the efficiency and safety of HVAC systems, ultimately protecting the integrity of installations and surrounding environments.

By adhering to this minimum depth, HVAC professionals ensure compliance with industry best practices and local codes, reinforcing the importance of proper drainage in air conditioning systems.