This article deals with the measurement of temperature fields in 3D airflow using an infrared camera and the measuring net with measuring targets. This method is based on the visualization of temperature fields on an auxiliary material (paper targets) which is inserted into the non-isothermal airflows. In the article is the description of the new developed measuring equipment for visualization 3D airstreams by an infrared camera. Temperature fields are made visible by an air-heating ventilator, and consequently the temperature field is evaluated. The ventilator generates approximately a rotate-circle airstream in the axis of ventilator mouth outlet. The results are compared to the similar measurement the using the equipment for visualization a temperature field in 2D airflows by an infrared camera and the compact sheet of textile. This measuring method can be used in many various applications such as air-heating and air-conditioning. and Obsahuje seznam literatury