How big is the Honda Feng Fan heating pipe?

16mm.

According to official data, the heating pipe of Honda Feng Fan is 16 mm, and Honda Feng Fan is more efficient in conveying warm air by assembling large-diameter heating pipes.

The warm air pipe is a pipe that brings the heat of the engine to the car through the "water" in the car water tank to keep the car warm. The heating water pipe has a tee and a direct pipe. The tee is a water inlet pipe and the direct pipe is a drainage pipe. The material of the water pipe is nylon rope and rubber.