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VENTILATION, VENTILATION, SUPPLY VENTILATION SYSTEM, FAN, PROPELLER FAN …
VENTILATION
:fountain_pen:Ventilation is the movement/ changing air in enclosed space
:fountain_pen:Provide fresh air for respiration
:fountain_pen: Provide moisture environment
:fountain_pen: Exchange of Oxygen & Carbon dioxide to reach the correct level respectively
:fountain_pen: Prevent excessive heat keep in the area
:fountain_pen: Allow odours, smoke, dust & contaminants being release out
:fountain_pen: Keep environment with freshness
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FAN
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:check: Main equipment in ventilation system
:check: Selection of fan
- Volume of air that needs to be controlled
-Noise Level
-Comfort Level
-Resistance on fan while spinning
-Implication from ducting design on the ability of fan
PROPELLER FAN 
:pencil2: Utilize long slender blades twisted in such a manner
:pencil2: Have more than one blade fixed to hub
:pencil2: Do not create much air pressure
:pencil2: Limited affect in ductwork, has little or no effect on control air flow
:pencil2: Cheap
:pencil2: Create noise
:pencil2: Use for air openings in windows & walls
:pencil2: Types of Propeller Fan
-Free Standing Propeller Fan
-Wall Mounted Propeller Fan
AXIAL FLOW FAN
:pencil2: basically propeller fans with shorter rigid blades
:pencil2: can be subdivided into two types, vane axial and tube axial
:pencil2: Able to develop high pressure
:pencil2: Use for moving air through long sections of ductwork
:pencil2: Integral wIth the run of ducting
:pencil2: Does not require a base
:pencil2: Less Space
:pencil2: Insulated Housing
-Protect fan-cooled motor in greasy, hot & corrosive gas situations
:pencil2: Types of Axial Flow Fan
-Bifurcated Axial Flow Fan
CENTRIFUGAL FAN
:pencil2: Normally use in industry
:pencil2: Able to produce high pressure
:pencil2: Large capacity for large volumes of air
:pencil2: Suit to larger installations
-Air Conditioning System
:pencil2: May consist one or two inlets
:pencil2: Less noise create
:pencil2: These fans are applied in building and equipment ventilation, hot-gas recirculation, dusthandling systems, and furnace and boiler forced draft/induced draft services.
WINDOW
:pencil2: The direction of wind allow the air to drawn out and forced in through the windows.
:pencil2: The direction of air in and out and the effectiveness of ventilation depends on the shape, position, size and number of windows.
:pencil2: Natural ventilation should be place on wall
WALL
:pencil2: Opening on wall allow wind to pass through
ROOF
:pencil2: Opening on the roof allow wind pass into the building
:pencil2: Proper vented roof allows heat to escape as the temperature outside increase
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The basic difference between centrifugal fans and the propeller and axial fans
-air enters the impeller axially and leaves the rotating element radially
CONSIDERATION IN CHOOSING VENTILATION SYSTEM
Types of Building, Space Function, Location of Building, Weather, Air Quality