HVAC Types of Fan and Specification

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Prepared by S M Afreen Ali 

MSc . BS in Engineering

What are the different types of fans?

Axial or propeller fans. There are three basic types of axial fans: propeller, tubeaxial, and vaneaxial. Propeller fans are most commonly used for dilution ventilation or cooling. These fans are often mounted in a wall or ceiling.

What is an HVAC fan?

HVAC fans and blowers are used to move air through heating, ventilating, and air conditioning (HVAC) systems. ... HVAC fans and blowers can be mounted to an exterior wall (ventilation unit) or above the ceiling (plenum fan), or used as part of a ducted system (duct fan).

What are the different types of fan used in refrigeration system?

There are basically four types of fan that are commonly used in the HVAC equipment. They are the propeller fan, centrifugal fan, vane-axial fan and tube-axialfan.

 There are three basic fan types that are usually encountered in the HVAC industry: The Axial Fan, the Forward Curved Centrifugal Fan and the Backward Inclined Fan. Axial fans, also known as propeller fans, are engineered to move a low volume of air under low static conditions.

It is common to classify fans in

• Axial and/or propeller fans
• Centrifugal (radial) fans
• Mixed flow fans
• Cross flow fans

Axial and Propeller Fans

In an axial fan the air flows in parallel to the shaft. It is common to classify axial fans upon their wheel like:

• C-wheel - Blades can be adjusted when running. High efficiency, small dimensions, variable air volume
• A-wheel - Blades can be adjusted only when the fan is standing still. High efficiency, small dimensions, adaptive to recommended air volume
• K-wheel - Blades can not be adjusted. Simple, small dimensions

Centrifugal fans

 

a centrifugal fan the air flows is in a radial direction relative to the shaft. Centrifugal fans can be classified by their wheel like:

• F-wheel - Curved forward blades. High efficiency, small dimensions, changing in pressure have little influence on pressure head.
• B-wheel - Curved backward blades. High efficiency, low energy consumption, changing in pressure have little influence on air volume. Low noise emission, stable in parallel running.
• P-wheel - Straight backward blades. High efficiency, self cleaning, changing in pressure have little influence on air volume
• T-wheel - Straight radial blades. Self cleaning. Suitable for material transport

Mixed flow fans

In a mixed flow fan the air flows in both axial and radial direction relative to the shaft. Mixed flow fans develops higher pressures than axial fans.

Cross-flow fans

In a cross flow fan the air flows in an inward direction and then in an outward radial direction

Types of HVAC fans and blowers include:

·         Vents or ventilation fans.

·         Plenum fans.

·         Duct fans.

·         Duct blowers.

·         Roof fans.

·         Exhaust fans.

·         Inline fans.

·         Tube axial fans.