Direct-fired air conditioners are equipment that provide a constant temperature and humidity environment for the paint spraying room. In order to ensure the consistency of the paint spraying effect, the paint spraying room needs to be operated in a certain temperature and humidity environment. Direct-fired air conditioners are the best solution. The fresh air flowing in the air duct passes through the linear burner, assists combustion and heats the air before entering the paint spraying room. The temperature is accurately controlled at 24°C±1˚C.