Axial fans of smoke removal BO-21-210 DU

BO-21-210 DU fans are equipped with axial wheels with the direct drive from common industrial asynchronous electric motors. Use in the mode of all-exchange ventilation is allowed, except: VO-21 - 210A-8DU-4/12, ZDU-6 and VO-21 - 210B-5DU-4/8DU-4/1 2,ZDU-8/12,5DU-6. Use of all fans in the mode of all-exchange ventilation is allowed at lowered not less than for 25% against the rotation frequency specified in the catalog (for example, with use of the frequency converter).