- Design variants: version 1; - Manufactured according to TU 28.25.20-001-8558 9750-2020; - Fans are certified: compliance with the requirements of TR EAEC 043/2017 and GOST R 53302-2009; - Casing made of galvanised steel; - Impellers of 3 types of execution - RV6k, RV6, RV9; - Impeller is mounted directly on the motor shaft; - Possible versions in terms of fire resistance: 400°C/2 hours and 600°C/1.5 hours; - Version with side discharge (VKRT) possible Mounting - Mounted on flat or sloping roofs of buildings and constructions on a mounting cup of STM type. - Operating conditions - The fans are operated in conditions of moderate (M) climate of the 1st placement category and moderate and cold (MC) climate of the 1st placement category according to GOST 15150-69; - Ambient temperature for M from -40 to +40 °С, for MC from -60 to +60 °С.