Termofan “TKS” model standard executaion air handling units are composed of 26 different sizes ranging from 1.500 to120.000 m³/h in air flow rates. The smallest model is TKS 7-7 outer crossection dimensions of 710 mm x710 mm wheares the largest model is TKS 22-22 with outer dimensions of 2235 mm x 2235 mm excluding aluminum frame. High airflow units can be designed with special dimensions.