Termofan TKS model standard air handling units are composed of 26 different sizes ranging from 1.500 m³/h and 120.000 m³/h in air flow rates. The smallest model is TKS 7-7 outer cross-section dimensions of 710 mm x710 mm wheares the largest model is TKS 22-22 with outer dimensions of 2.235 mm x 2.235 mm. Higher air flow units can be designed with special dimensions.

By joining the air intake and/or air mixing sections, filter sections, air heater and air cooler sections, humidifiers and ventilators it is possible to create tailor-made units serving different design purposes. It is also possible to make double deck executions with or without heat recovery units.