TDA-Air heating system are gas burners designed to operate in an airflow with minimum speed of 0.5 M / sec. In air ducts , where TDA is installed, the products of combustion are mixed directly with airflow to be superheated. The design guarantees high efficiency and clean combustion . For the production of large volumes of hot air in industrial processes such as drying of products , spray booths, heating of work environments etc., our elaborating is the be3st consideration .