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which type of fans best efficiency ?
Fan classification:
Centrifugal (flow radial to fan shaft)
Blade type
Backward inclined
straight/flat blade
Air foil
Radial (only for industrial application)
Forward inclined
Straight/Flat Blade
Forward curved
Housing type
Scroll type (housed fan)
Single width ( ducted inlet from one side )
Double width (air enters from two sides)
Plug type
In line (tubular )
Roof top (dome) used for low static exhaust
Plenum
Axial (flow parallel to fan shaft)
Blade type
Slanted Blades
Air Foil
Cambered Twist
Housing type
Propeller (common for relief, low pressure exhaust)
Tube Axial
Vane Axial
Fixed pich
Adjustable Pich
Variable Pitch
Mixed Flow (hybrid Part centrifugal and part axial)
Blade type
Contoured single thickness
Air foil
Housing type
In line
Mainly there are2 types of ventilation fans. One is used to exhaust air from the building and the other to introduce the fresh air in the building.
For exhausting the air we will use Dome type spun aluminum casing centrifugal fans either direct driven type or belt driven type. This is applicable for toilet exhaust, operation theater etc. For car part exhaust we use cabinet type centrifugal fans.
For small toilets like that of residential housed we use wall mounted axial fan.
For fresh air introduction to the building we use centrifugal fans cabinet type or axial fans,
