Downblast Direct Drive Centrifugal Roof Exhaust Fans

Spun Aluminum Centrifugal Fan Series


High Wind Tie-Down Kit Option Available

Model Features

  • Exhaust air up to 4,984 CFM in high static pressure applications up to 2-1/4" w.g.
  • Attractive spun aluminum exterior
  • Direct drive units have low sound levels and quiet operation
  • Curved non-overloading backward inclined wheel for efficiency at higher static pressures
  • AMCA Air and Sound Licensed
  • cULus 705 Listed
  • Ecowatt® (SDBDe Models)
  • Miami-Dade NOA and Florida Product Approval Option Available
  • Listed with the Texas Department of Insurance under Product Evaluation RV-126 for wind load and windborne debris resistance per IRC/IBC 2018

AMCA Air and Sound LicensedcULus Listed Ecowatt RegisteredMiami Dade Approved

Model Overview

SDBD and SDBDe direct drive fans are designed to exhaust air up to 4,984 CFM, with high static pressure capability up to 2-1/4". The non-overloading backward inclined wheel with its higher static pressure capability makes these units suitable for either ducted or non-ducted applications. The spun aluminum exterior provides an attractive appearance and is compatible with belt driven Model SDB and companion gravity units to make up a complete ventilation system. Direct drive units use smaller diameter wheels, resulting in low sound levels and quiet operation. They have no belts or fan bearings to maintain or adjust and consequently require very little maintenance. Its roof mounting permits short duct runs and more efficient operation.

SDBD and SDBDe are generally used to exhaust air from all types of commercial and institutional buildings such as hospitals and healthcare facilities, schools, recreational buildings, machinery and equipment rooms, offices, retail stores and similar applications.

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

Size CFM Range Max SP
6 53 to 351 3/4"
7 79 to 476 3/4"
8 187 to 892 7/8"
10 398 to 1,348 1"
12 479 to 1,885 1-1/4"
14 858 to 3,507 1-1/2"
15 779 to 4,083 2"
16 966 to 4,733 2-1/4"
18 1,100 to 4,194 1-1/4"

SDBD and SDBDe Kits

Select S-Series (Centrifugal Roof Fans) models are now hurricane and high wind certified for wind-borne debris impact resistance and wind load design pressures up to ±150 PSF.

Tie down kit

High Wind Tie-Down Kit

Non-flanged horizontal mount exhaust backdraft damper

  • Tie-downs
  • Fastened motor cover
  • Reinforced birdscreen

Note: Additional accessories are available for certain products. Contact your S&P Representative for more information about these accessories.

Standard Accessories

Automatic (Gravity) Damper    
Backdraft Damper  
Clip Lock Curb Submittal  
Curb Cap Adaptor Submittal  
Curb Hinge Arrangement    
Motor Operated Damper    
Roof Curb Submittal  
Self-Flashing Curb Submittal  
Solid State Speed Control    
Ventilation Gas Detectors Submittal IOM

Ecowatt® Accessories

Constant Pressure System    
Potentiometer Submittal  
EC Differential Pressure Control   IOM
EC Motor Speed Control    
ECM Multi-Speed Control   IOM
Centrifugal Roof and Sidewall Catalogue  
General Catalogue Section  
Ecowatt® Brochure
Typical Specification Sheet (SDBD)  
Typical Specification Sheet (SDBDe)  
  • General / Clean Air
  • Spark Resistant
  • Bathrooms
  • Garages
  • General (Non-Grease) Kitchen Areas
  • Offices
  • Dormitories
  • Manugacturing and Assembly Plants
  • Warehouses
  • Places of Worship
  • Schools
  • and many more...