ACME Fan Downblast Centrifugal Roof Exhaust Fan 8 inch 580 CFM 115 Volt Direct Drive PRN080-30026A
FloAire Centrifugal Downblast Roof Exhaust Fan 10.5 inch 650 CFM Direct Drive DR12H
ACME Fan Downblast Centrifugal Roof Exhaust Fan 10 inch 770 CFM 115 Volt Direct Drive PRN1000026
ACME Fan Downblast Centrifugal Roof Exhaust Fan 11 inch 1090 CFM 115 Volt Direct Drive PRN1100026
SDBD Centrifugal Roof Exhaust 6 inch 182 CFM 230 Volt Direct Drive SDBD06CJH1CS
SDBD Centrifugal Roof Exhaust 6 inch 351 CFM 230 Volt Direct Drive SDBD06JH1CS
SDBD Centrifugal Roof Exhaust 7 inch 476 CFM 230 Volt Direct Drive SDBD07JH1CS
SDBD Centrifugal Roof Exhaust 8 inch 862 CFM 230 Volt Direct Drive SDBD08JH1CS
HAWKEYE - Downblast Exhauster 10.50 inch 700 CFM Variable Speed
SDBD Centrifugal Roof Exhaust 6 inch 182 CFM 115 Volt Direct Drive SDBD06CJH1AS
SDBD Centrifugal Roof Exhaust 6 inch 351 CFM 115 Volt Direct Drive SDBD06JH1AS
SDBD Centrifugal Roof Exhaust 7 inch 476 CFM 115 Volt Direct Drive SDBD07JH1AS
Low Profile Direct Drive Centrifugal Roof or Sidewall Exhaust 8 inch 387 CFM LPD081AS
SDBD Centrifugal Roof Exhaust 8 inch 862 CFM 115 Volt Direct Drive SDBD08JH1AS
SDBD Centrifugal Roof Exhaust 8 inch 892 CFM 230 Volt Direct Drive SDBD08MH1CS
FloAire Centrifugal Downblast Roof Exhaust Fan 11.75 inch 1300 CFM Direct Drive DR33H
SDBD Centrifugal Roof Exhaust 8 inch 592 CFM 115 Volt Direct Drive SDBD08HM1AS
ACME Fan Downblast Centrifugal Roof Exhaust Fan w/ EC Motor 8 inch 580 CFM 115 Volt Direct Drive PRN080-3EC0031
SDBD Centrifugal Roof Exhaust 10 inch 949 CFM 230 Volt Direct Drive SDBD10MM1CS
ACME Fan Downblast Centrifugal Roof Exhaust Fan 11.8 inch 1582 CFM 115 Volt Direct Drive PRN1180011
ACME Fan Downblast Centrifugal Roof Exhaust Fan w/ EC Motor 10 inch 770 CFM Direct Drive PRN100EC0031
ACME Fan Downblast Centrifugal Roof Exhaust Fan 12.6 inch 1760 CFM 115 Volt Direct Drive PRN1260011A
SDBD Centrifugal Roof Exhaust 10 inch 1348 CFM 230 Volt Direct Drive SDBD10PH1CS
ACME Fan Downblast Centrifugal Roof Exhaust Fan w/ EC Motor 11 inch 1090 CFM Direct Drive PRN110EC0031
ACME Fan Downblast Centrifugal Roof Exhaust Fan 13.5 inch 2160 CFM 115 Volt Direct Drive PRN1350020A
ACME Fan Downblast Centrifugal Roof Exhaust Fan 14.5 inch 2540 CFM 115 Volt Direct Drive PRN1450020A
HAWKEYE - Downblast Exhauster 12.25 inch 1300 CFM Variable Speed
FloAire Centrifugal Downblast Roof Exhaust Fan 13.75 inch 1850 CFM Direct Drive DR50H
HAWKEYE - Downblast Exhauster w/ EC Motor 10.50 inch 1100 CFM Variable Speed
SDBD Centrifugal Roof Exhaust 8 inch 892 CFM 115 Volt Direct Drive SDBD08MH1AS
SDBD Centrifugal Roof Exhaust 10 inch 949 CFM 115 Volt Direct Drive SDBD10MM1AS
Canarm ALX DD-EC Series Downblast Exhauster w/ EC Motor 12 inch 1544 CFM Direct Drive
SDBD Centrifugal Roof Exhaust 10 inch 1348 CFM 115 Volt Direct Drive SDBD10PH1AS
FloAire Centrifugal Downblast Roof Exhaust Fan 15.75 inch 3200 CFM Direct Drive DR85H
ACME Fan Downblast Centrifugal Roof Exhaust Fan w/ EC Motor 11.8 inch 1582 CFM Direct Drive PRN118EC0020
ACME Fan Downblast Centrifugal Roof Exhaust Fan w/ EC Motor 12.6 inch 1760 CFM Direct Drive PRN126EC0024
HAWKEYE - Downblast Exhauster 15 inch 2400 CFM Direct Drive
FloAire Centrifugal Downblast Roof Exhaust Fan 13.75 inch w/ Speed Control 1850 CFM Direct Drive DR50H-ECM
SDBD Centrifugal Roof Exhaust 12 inch 1281 CFM 230 Volt Direct Drive SDBD12MM1CS
SDBD Centrifugal Roof Exhaust 14 inch 2196 CFM 230 Volt Direct Drive SDBD14MM1CS
ACME Fan Downblast Centrifugal Roof Exhaust Fan w/ EC Motor 13.5 inch 2160 CFM Direct Drive PRN135EC0022
ACME Fan Downblast Centrifugal Roof Exhaust Fan w/ EC Motor 14.5 inch 2540 CFM Direct Drive PRN145EC0022
SDBD Centrifugal Roof Exhaust 12 inch 1902 CFM 230 Volt Direct Drive SDBD12QH1CS
HAWKEYE - Downblast Exhauster 16.50 inch 3500 CFM Direct Drive
Canarm ALX DD-EC Series Downblast Exhauster w/ EC Motor 15 inch 2000 CFM Direct Drive
Canarm ALX DD-EC Series Downblast Exhauster w/ EC Motor 13.5 inch 1578 CFM Direct Drive
FloAire Centrifugal Downblast Roof Exhaust Fan 15.75 inch w/ Speed Control 3200 CFM Direct Drive DR85H-ECM
HAWKEYE - Downblast Exhauster 13.50 inch 1146 CFM Belt Drive
How Do I Choose the Right Downblast Fan for My Building?
Selecting the proper downblast exhaust fan starts with calculating your facility's air change requirements and understanding the differences between direct drive and belt drive configurations. First, determine your space's cubic footage by multiplying length × width × height. Next, identify how many air changes per hour your application requires – warehouses typically need 6-8 changes, while restaurant ventilation and commercial kitchens may require 15-20, and bathroom fans need fewer changes. Multiply your cubic footage by the air changes needed, then divide by 60 to find your minimum CFM requirement. You can use our online calculator to do the math for you. Our technical team can help you factor in high static pressure applications, duct length, altitude adjustments, and proper roof curb installation to specify the exact centrifugal downblast exhaust fan model for optimal airflow performance.
What Makes Downblast Fans Different from Standard Roof Exhausters?
Unlike traditional gravity ventilators or inline fans, downblast centrifugal designs discharge exhaust downward towards the roof surface, preventing recirculation and protecting the fan from excess snow and debris build-up. The centrifugal fan wheel creates higher pressure than standard propeller roof mounted fans, making these units ideal for high wind conditions and applications with long duct runs or multiple intake points. This design also minimizes rain infiltration through integrated backdraft damper systems and allows for easier winterization in cold climates. The horizontal discharge pattern reduces wind resistance and prevents exhaust air from affecting nearby supply fans, HVAC equipment, or building air intakes, creating a natural air curtain effect.
What Are the Long-Term Operating Costs?
Modern centrifugal roof exhaust fan models deliver significant energy savings through advanced motor compartment designs that eliminate belt maintenance and achieve lower operating rpm for reduced power consumption compared to older models. Variable frequency drives (VFDs) provide precise speed control, potentially cutting energy use by 30-50% during partial-load conditions while maintaining low noise levels. Most units feature permanently lubricated bearings and are available in durable materials including galvanized steel and stainless steel construction, in addition to aluminum options. These materials resist corrosion without painting or coating, and hinge kit sizes allow easy access for maintenance. With proper sizing and installation including appropriate utility sets, these general clean air applications typically operate for 15-20 years with minimal intervention, making them ideal for clean air environments.
Why Shop at Industrial Fans Direct for Downblast Centrifugal Roof Exhaust Fans?
Industrial Fans Direct brings over 20 years of ventilation expertise to every customer interaction, helping you select the right centrifugal roof exhauster or ceiling exhaust fans without upselling or pushing unnecessary features. Our non-commissioned sales team focuses solely on matching you with equipment that meets your specific requirements and budget, whether you need a basic exhaust fan or a complete system. We maintain strong relationships with leading manufacturers to offer competitive pricing on all products, backed by our Low Price Guarantee that beats any competitor. Most orders ship within 24-48 hours, and our technical support team provides guidance through selection, installation, and troubleshooting to maximize your investment's performance and longevity.