What is the minimum vertical drop required from the outlet of the condensate drain pan to the inlet of the P-trap?

The minimum vertical drop required from the outlet of the condensate drain pan to the inlet of the P-trap is 3 inches. This specification is established to ensure that the condensate flows effectively and does not back up into the drain pan. The appropriate drop helps maintain proper drainage by creating sufficient gravitational force to guide the condensate into the P-trap, preventing any potential for clogging or overflow that could occur if the drop were less than the required minimum. Ensuring this measurement is adhered to is critical for the effective functioning of the HVAC system, as it directly influences the handling of moisture and helps prevent issues like water damage or system inefficiency.