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Turbo Air Ventilators
Performance Ratings
The hot air in the premises rises up naturally and stays below the roofing thereby increasing the inside temperature. The engineering design of the Devashish Turbo Air Ventilators enables the rotation of the fan in the lowest wind conditions. The continuous movement of the Devashish Turbo Air Ventilators vanes creates a vacuum beneath the fan and the centrifugal force leads to the suction of hot air from beneath the roof. Warm air rushes up to fill the vacuum and is expelled in the outside atmosphere through the airfoil vanes even in the lowest wind conditions.
Stack Height
(m)		 Wind Speed
(km/hr.)		 Temp Diff.
C		 Exhaust Rating in Cubic meters per Second
DI Models (Actual diameter in mm)
300 500 600 650 700
    6 0.158 0.437 0.630 0.800 0.984
  6.4 11 0.183 0.508 0.732 0.929 1.145
    17 0.188 0.522 0.751 0.954 1.175
    6 0.184 0.512 0.738 0.937 1.154
  8.0 11 0.191 0.530 0.763 0.969 1.194
6.1   17 0.199 0.553 0.797 1.012 1.246
    6 0.277 0.767 1.105 1.404 1.729
  12.8 11 0.285 0.792 1.141 1.449 1.784
    17 0.310 0.860 1.239 1.573 1.937
    6 0.344 0.956 1.377 1.748 2.153
  16.0 11 0.354 0.982 1.414 1.795 2.211
    17 0.367 1.018 1.467 1.863 2.294
    6 0.166 0.461 0.664 0.843 1.038
  6.4 11 0.188 0.522 0.751 0.954 1.175
    17 0.210 0.582 0.839 1.065 1.312
    6 0.196 0.545 0.785 0.997 1.228
  8.0 11 0.199 0.553 0.797 1.012 1.246
9.14   17 0.230 0.660 0.922 1.171 1.441
    6 0.279 0.775 1.116 1.417 1.745
  12.8 11 0.310 0.860 1.239 1.573 1.937
    17 0.321 0.891 1.238 1.630 2.007
    6 0.352 0.997 1.408 1.773 2.197
  16.0 11 0.367 1.018 1.467 1.863 2.295
    17 0.371 1.033 1.486 1.888 2.324
 
How to specify Size and Model Number
Obtain cubic volume area to be ventilated (Width x Length x Height).
Multiply by air charges required per hour and bring to m3/s by division
Divide by number of ventilators desired (approximately 6 meter spacings).
From performance rating chart determing the model.