Optisizer Scheduled Maintenance

IMPORTANT ANNOUNCEMENT: Optisizer will be down for maintenance from Friday, February 22, 5:00 PM EST until Monday, February 25, 8:00 AM EST. We apologize for the inconvenience and thank you for your patience.

Downblast Direct Drive Centrifugal Roof Exhaust Fans

Spun Aluminum Centrifugal Fan Series


Model Features

  • Exhaust air up to 4,984 CFM in high static pressure applications up to 1-1/2" 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)

AMCA Air and Sound Licensed   cULus Listed   Ecowatt Registered

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 1-1/2". 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
06 53 to 351 3/4"
07 79 to 476 3/4"
08 187 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 1-3/4"
16 1,317 to 4,984 1-3/4"

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

Standard Accessories

Automatic (Gravity) Damper Submittal   IOM
Curb Hinge Arrangement Submittal   IOM
Motor Operated Damper Submittal   IOM
Roof Curb Submittal   IOM
Solid State Speed Control Submittal   IOM

Ecowatt® Accessories

Constant Pressure System Submittal   IOM
Potentiometer Submittal   IOM
EC Motor Speed Control Submittal   IOM
ECM Multi-Speed Control Submittal   IOM
Centrifugal Roof and Sidewall Brochure  
General Catalogue Section  
  • 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...