Page 180 - Mechanical Engineer's Data Handbook

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Max. Static
efficiency No. of pressure Velocity
Type and application Arrangement blD (%I vanes (cm H,O) triangle
w6 h
Radial vanes: Ve- v,
(paddle wheel), 0.35-0.45 60-70 6-8
mill exhaust

ve* v,

3-
Backward-curved
vanes:
air conditioning 0.25-0.45 75-90 8-12 12-15

Forwardcurved vanes:
ventilation 0.50-0.60 55-60 16-20 7-10