Curvent offers mechanical ventilations solutions for industrial and commercial applications.These industral fans offer numerous benefits when used properly. They help create a healthy work atmosphere. They also remove pollutants, air contaminants, smoke, and reduce offensive odors. They can also be used to decrease the heat and humidity levels.

There are two types of fans used for the transmission of air. When the air enters the impellers axially and is discharged radially from the impeller, it is called a centrifugal or radial flow fan. When the air flows parallel to the axis of the impeller, it is called an axial flow fan.


Centrifugal Fan: 

Centrifugal fans are very popular in the duct air conditioning system. The centrifugal fan has an impeller mounted in a volute casing. The fan impeller of the centrifugal fan can have the following profiles:


Radial or straight blades: It is a simple impeller construction. The blades run straight from a central point. These fans provide very high pressure at high speeds of rotation.

Forward Curved Blades: These blades are shallow in depth. These fans are efficient and have less noise.


Backward curved blades: They have to be operated at higher speeds for the same pressure. Due to their higher speeds, they can be directly coupled to the motors.

Axial Flow Fan: 

These fans are never used in duct air conditioning system as they cannot develop high pressures, however, they can handle large
quantities of air.The axial flow fans are of the following types:


Propeller Fan: A propeller fan consists of a propeller in a mounting ring. They are used when the resistance to air movement is small as in the ventilation of bathrooms, and attic spaces.

Tube Axial Fan: It consists of a propeller fan housed in a simple cylinder. These types of fans can be installed in round ducts. The air flow in the tube is spiral on its way out.


Vane Axial Fan: A vane axial fan has a tube axial fan along with guide vanes to stop the spiral movement of air.


For ventilation of toxic substances, the exhaust fan is the device used that draws the air through the entire system. The extractor fans must be capable of generating enough of pressure drop to draw the required volume of fumes through the hood, ducts, and collecting devices at the correct velocity, and of overcoming the resistance to air flow from hoods, ducts, and collecting devices


Curvent International will help you evaluate the utility it needs to provide for as well as the environmental conditions, pressure levels, and surface area affected.  



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July 6, 2018

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Curvent assisted Chabo & Joubert Aircon Services, by the supply and installation of natural ventilation at Metso Manufacturing.  This was done by the extraction of the chemical fumes with 4...

September 22, 2017

Multistory above and below ground car parks are becoming more common due to increased public reliance on cars as well as the congestion in towns and cities resulting from higher population densities. Motor vehicle engines running within an enclosed space will result in poor air quality and the confinement also increases the potential threat of smoke inhalation in the event of a fire.  It is essential to ventilate covered car p...

Any ventilation system will have slight performance fluctuations. As with any piece of machinery, a ventilation system is subject to wear, misalignment and breakdowns. Only through regular and thorough maintenance can it remain in effective operating condition.

The following are a few of the more common problems to be aware of:

Hood System

  • Adjustable slots have been altered 

  • Resistance has been changed (i.e., the hood...

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