ROOF VENTILATOR FOR SMOKE REMOVING Russian patent published in 2000 - IPC

FIELD: ventilation system manufacture, possibly development of roof ventilator working in hot gas condition for removing smoke, for example at fire occurring. SUBSTANCE: roof ventilator for removing smoke includes impeller, guiding apparatus, electric drive unit placed in casing, and inlet manifold. Ventilator also includes heat insulation screen arranged at side of drive unit and additional impeller with autonomous drive. Cylindrical housing of autonomous drive is mounted on upper portion of casing of electric drive unit and it has in upper portion air intake and guiding branch pipe introduced into cavity of casing. EFFECT: increased useful life period of ventilator. 1 dwg