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.


amca air performanceThe New York Blower Company certifies Class 4 Backward Inclined Single Width Fans are licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 211 and comply with the requirements of the AMCA Certified Ratings Program.

  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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