SENSOR ASSEMBLY

A sensor assembly includes a housing defining a chamber. A sensor unit is supported by the housing and extends vertically upward along an axis from the housing. The sensor unit includes a base and a sensor housing mounted to the base and rotatable relative to the base about the axis. The sensor unit includes a sensor. The sensor housing extends circumferentially around the sensor and defines a sensor chamber therebetween. A blower box is supported by the housing in the chamber. The blower box defines a blower chamber in fluid communication with the sensor chamber. A blower is disposed in the blower box.