According to various aspects, exemplary embodiments are disclosed of blow through direct fired heaters including evaporator coils and/or energy recovery ventilation.

A cartridge with a controller for controlling cold and hot fluid flows to form a mixture, a slide valve for controlling a mixture temperature, a thermostatic element that controls a position of the slide valve along an axis, and a single handle for controlling the mixture flow and temperature, which is movably mounted to actuate and drive the controller and move the thermostatic element along the axis.