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About VENTILATION

 

 

 What is Air Flow?

Air Flow is the amount of air that a fan will move under different conditions,usually expressed as volume of air move­ment per unit time. The two most-used unit are imperial unit cubic feet per minute (cfm) and metric unit cubic meter per hour (m3/h).

 

What is Static Pressure?

Static Pressure is the pressure difference that a ventilation fan creates between the inside and outside of a room. Static pressure is usually measured in inches of water column(imperial) or pascal(metric).

 

What is Fan Efficiency?

Fan Efficiency is the amount of air delivery per unit of electricity power used, given in cubic feet per minute per watt (cfm/W) or cubic meter per hour per watt (m3/h·W).Generally, small fans are less efficient than larger fans,and belt drive fans are less efficient than direct drive fans.

 

How Fan is rated?

Fans should be rated by an independent lab to show air flow and efficiency base on a range of different static pressures.

Two of the most influencial fan testing labs are Bioenvironmental and Structural Systems (BESS) lab at the University of Illinois and Air Movement and Control Assosiation(AMCA).

 

What fan guard is for?

Guards can protect people from the fan and also the fan from intruding objects.Generally,they have little effect on fan performance and should always be installed where applicable.

 

What fan shutter is for?

Shutters can sustantially reduce fan performance but they are necessary for times when fans are not operating to prevent back drafting. Dirty shutters and blades can greatly reduce air flow,so regular cleaning and maintenance is needed to keep fans operating at their original efficiency.

 

What fan cone is for?

Fan discharge cones can increase fan efficiency,also they serve as wheather hood to prevent rains or snow from getting inside the fan housing.

 

What is the difference between Exhaust Fan,Pressure Fan and Recirculation Fan?

Exhaust Fans can create a negative pressure(a slight vacuum) within a room by exhausting air.The indoor will have a lower pressure than the outdoor.

Pressure Fans increase room pressure by supplying air. The indoor will have a higher pressure than the outdoor.

 

Recirculation Fans, such as panel fan or basket fan, will operate with no static pressure.

Locations
  • Topcool HeadquartersHengjiang Industrial Zone,Fuwan Town,
    Gaoming District,Foshan City,
    Guangdong Province,China
    Phone:  86-757-88861830 Fax: 86-757-88861828
    Email:   info@topcool.co

 

 

 

 

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