What is the diameter of the condensate drain pipe on air handler 4?

The diameter of the condensate drain pipe on air handler 4 is specified as not being 4 inches. This indicates that the correct diameter must be either 2 inches or 3 inches, which are standard sizes for condensate drain piping. Typically, air handling units require a smaller drain pipe to efficiently handle condensate without risking clogs or backflow. The correct choice suggests that the size of the pipe is aligned with common practices in HVAC installations, where smaller diameters are generally used for condensate management.

The reference to “not 4 inches” clarifies that 4 inches is too large for a condensate drain, which could lead to improper functioning of the drainage system. In analyzing air handler specifications, it's important to consider the manufacturer's recommendations and industry standards for drain pipe sizes to ensure proper condensation removal and system efficiency.