FDA Series

Double Inlet Forward Curved Centrifugal Fans - Forward Wheels

• The FDA series is DIDW centrifugal fans with forward curved impellers.
• The fans are suitable for supply or extract applications in commercial, process and industrial HVAC systems.
• Sizes of the series are in accordance with AMCA standard 99-0098-76 R20.

Dimensions

Type S

This type is supplied with mounting feet and can be mounted in three different orientations.

The construction is mainly for OEM application which only subject to testing and approval.

Fan size: 160 to 710
Volume: 1000 to 50000 m³/h
Total pressure: up to 1400 Pa

Type C

This type has a frame fitted on both sides of the fan which gives better strength and rigidity.

It allows mounting in four different orientations.

Fan size: 160 to 710
Volume: 1000 to 50000 m³/h
Total pressure: up to 1400 Pa

Type T

This type has a welded frame giving increased stiffness and rigidity required for higher operating performance.

Fan size: 250 to 1400
Volume: 2500 to 250 000 m³/h
Total pressure: up to 1600 Pa

Type T

This type has a welded frame giving increased stiffness and rigidity required for higher operating performance.

Fan size: 250 to 1400
Volume: 2500 to 250 000 m³/h
Total pressure: up to 1600 Pa

FDA series are also available in twin fan version with two double inlet fans mounted on the same shaft.  To select for win fans, use the curves of single fan with the following factors: 

• Volume x 2
• Absorbed Power x 2.15
• Speed x 1.05
• Noise + 3 dB

This series is available in type S2, C2 or T2

Performances of Twin fans are not AMCA licensed

Type C2

Type S2

Type T2

Fan Rotation and Discharge

The rotation and discharge of the fan is in accordance with AMCA standard 99-2406-83. The direction of rotation is determined from the drive side of the fan:

Motor Position 

The position of the motor for belt drive centrifugal fan is in accordance with AMCA standard 99-2407-66.
Location of motor is determined by facing the drive side of fan and designating the positions by letters W, X, Y or Z. 

Motor Selection

The power curve shown on each performance curve represents the absorbed power at the shaft of the fan measured in kW.
To determine the power of the motor to be installed, a correction factors should be applied to compensate for transmission losses.
For conversion to horsepower (HP), use multiplying factor 1.34.

Inspection Doors

The inspection door can be supplied upon request in one of three positions: P3, P4, P5.

Bearings

The bearings are lubricated for life and maintenance-free. If re-lubrication is necessary, it is recommended to use a lithium base grease suitable for all temperatures within the operational limits. Bearings used are either deep groove ball bearing type with an adaptor sleeve or spherical roller bearings type sealed at both sides for different duty appllcation classified as below:

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