Backward Inclined Single Width Class 4 Fans

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NYB Class 4 Fans extend the performance of Single-Width Fans to the higher pressure ranges required by some industrial-process applications. The Class 4 features AcoustaFoil® wheels for highly efficient handling of clean and dry gas streams and PLR-wheels for moist or mildly contaminated gas streams. Contact us today about our SWSI Backward Inclined Single Width Fans - Class IV.

  Backward Inclined Single Width Class 4 Fans PDF Brochure
Wheel Design: Backward Inclined-Airfoil
Backward Inclined-Single Thickness
Wheel Design

backward inclined airfoil wheel design

Backward Inclined-Airfoil: Aerodynamic airfoil-blade is the most efficient design with the lowest sound levels for clear air applications. 






backward inclined single thickness wheel design

Backward Inclined-Single Thickness: Flat, single-thickness blade surface best suited for airstreams with light material.  

Design Features:

VOLUME - to 170,000 CFM (288,800 m3/hr)

PRESSURES - to 20" WG (4,980 Pa)

TEMPERATURES - to 750°F (400°C)

14 SIZES - 18"-73" (457mm-1,855mm)


AMCA Class 4

Available Materials of Construction:

Carbon Steel
Stainless Steel
Special Alloys

Product Bulletin: Backward Inclined Centrifugal Class IV Fans (161) SWSI Fans, Size 80 and 89 (CS-137)
Guide Specifications: Specifying Class 4 Fans with AcoustaFoil Wheels (GS-161) Specifying Class 4 Fans with PLR Wheels (GS-162)
Engineering Supplements: Direct Drive - Class 4 Backwardly Inclined Fans (ES-163)
Installation, Operation & Maintenance Manual: IM-100
Material Specifications: SWSI_CLASS-4_Dims.pdf
Similar Products

AF Fans (For higher pressure requirements)
Backward Inclined Single Width Class 1-3 Fans (For lower pressure requirements)

Fan-to-Size Online:

Class 4 SWSI

Online Drawings:

Class 4 SWSI

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