SQB Belt Drive Square Inline Centrifugal Duct Fan

In-line/Sidewall Duct Fan Series

SQB Model

Model Features

  • Exhaust air up to 24,000 CFM in high static pressure applications up to 3-1/2" w.g.
  • Belt drives permit easy performance adjustments when needed
  • Ideal for applications where space is limited
  • Non-overloading backward inclined wheel for efficiency at higher static pressures
  • AMCA Air and Sound Licensed
  • cULus 705 Listed
  • This product meets the requirements of Buy American (2009) and Build America, Buy America (BABA), as part of IIJA (2022). Download letter here.

AMCA Air and Sound cULus   BABA-ACT

Model Overview

SQB square in-line duct mounted fans are available in sizes 7 through 42, moving from 100 to over 24,000 CFM, with high static pressure capability up to 3-1/2". SQB units are the perfect selection for clean air applications where space is a leading consideration. The compact housing with removable access doors and side discharge can be mounted in any orientation. AMCA licensed performance and UL listing assure that you've made a reliable selection.

2-year fan housing warranty, 1-year motor warranty

Size CFM Range Max SP
7 86 to 423 1-3/4"
8 331 to 1,318 1-3/4"
10 436 to 2,027 2"
12 769 to 3,384 2"
15 1,135 to 4,421 2-1/4"
HP15 741 to 3,539 3-1/2"
18 1,443 to 6,111 2-1/4"
HP18 1,714 to 4,240 3"
20 2,028 to 7,916 2-1/4"
HP20 1,908 to 6,248 2-3/4"
24 2,395 to 11,240 2-1/4"
HP24 3,195 to 10,996 3-1/2"
30 3,879 to 15,168 2-1/4"
HP30 3,906 to 12,632 3-1/2"
36 5,189 to 18,767 2"
HP36 5,958 to 16,117 2-1/2"
42 6,669 to 24,544 1-1/4"
Dimensional drawing for the SQB models.

Dimensional data is displayed in inches.

Size A B C
7 15 23 11-7/8
8 15 23 11-7/8
10 17 23 13-7/8
12 21 23 17-7/8
15 24 30 21-7/8
18 28 30 23-7/8
20 32 34 27-7/8
24 39 38 34-7/8
30 44 40 39-7/8
36 52 45 47-7/8
42 58 53 53-7/8

Standard Accessories

Assorted Disconnects    
Backdraft Damper Submittal  
Belt Guard    
Ecowatt® Drive Submittal Flyer
External Grease Fittings    
Hanging Bracket/Mounting Foot with Hanging Spring Isolator    
Hanging Rubber in Shear Isolator    
Hanging Spring Isolator    
Heavy-duty Disconnect    
Inlet Guard    
Insulated Housing    
Motor Cover    
Mounted and Wired Disconnect    
Outlet Guard    
Side Discharge    

Product Line Overview PreviewDownload
General Catalog Section Preview Download
Typical Specification Sheet Preview Download
Submittal PreviewDownload
IOM PreviewDownload

  • General/Clean Air
  • Spark Resistant
  • Offices/Common Areas