Inline Centrifugal & Mixed Flow Fans

When maximum airflow is needed, inline centrifugal fans and mixed flow inline fans do a fantastic job of delivering fresh air where it’s needed. HVACDirect.com has an unsurpassed selection of both types, supplied by the best manufacturers in the business - Soler & Polau (S&P) VENTS-US

For what they do and for all their benefits, the inline centrifugal fan and the mixed flow inline fan represent an amazing value for your investment. HVACDirect.com is committed to offering the highest quality products at the lowest prices possible. Ordering is easy, thanks to our well-trained customer service staff, and shipping is fast.

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22 Item(s)

  • VENTS-US TT Series 4" Inline Mixed Flow Fan - TT 100

    VENTS-US TT Series 4" Inline Mixed Flow Fan - TT 100

    Model: TT 100
    Low Price: $75.90
  • VENTS-US TT Series 5" Inline Mixed Flow Fan - TT 125

    VENTS-US TT Series 5" Inline Mixed Flow Fan - TT 125

    Model: TT 125
    Low Price: $97.90
  • VENTS-US TT Silent Series 4" Inline Mixed Flow Fan - TT SILENT 100

    VENTS-US TT Silent Series 4" Inline Mixed Flow Fan - TT SILENT 100

    Model: TT SILENT 100
    Low Price: $108.90
  • VENTS-US TT Series 6" Inline Mixed Flow Fan - TT 150

    VENTS-US TT Series 6" Inline Mixed Flow Fan - TT 150

    Model: TT 150
    Low Price: $130.90
  • VENTS-US TT Series 8" Inline Mixed Flow Fan - TT 200

    VENTS-US TT Series 8" Inline Mixed Flow Fan - TT 200

    Model: TT 200
    Low Price: $192.50
  • VENTS-US TT Silent M Series 4" Inline Mixed Flow Fan - TT SILENT M 100

    VENTS-US TT Silent M Series 4" Inline Mixed Flow Fan - TT SILENT M 100

    Model: TT SILENT M 100
    Low Price: $224.40
  • VENTS-US VK 315 Series 12 3/8" Inline Centrifugal Plastic Fan - VK 315

    VENTS-US VK 315 Series 12 3/8" Inline Centrifugal Plastic Fan - VK 315

    Model: VK 315
    Low Price: $317.90
  • VENTS-US TT Series 10" Inline Mixed Flow Fan - TT 250

    VENTS-US TT Series 10" Inline Mixed Flow Fan - TT 250

    Model: TT 250
    Low Price: $328.90
  • VENTS-US 12" AntiRADON In-Line Centrifugal Plastic Fan - VK 315

    VENTS-US VK-AntiRADON 315 12" Plastic Radon Mitigation Fan

    Model: VK-AntiRADON315
    Low Price: $343.20
  • VENTS-US 12" In-line Centrifugal Metal Fan - VKMs 305 Series

    VENTS-US VKMS 305 12" In-line Centrifugal Metal Fan

    Model: VKMS305
    Low Price: $383.90
  • VENTS-US 12" AntiRADON In-Line Centrifugal Fan Metal Fan - VKMs 305

    VENTS-US VKMS-AntiRADON 305 12" Radon Mitigation Fan

    Model: VKMS-AntiRADON305
    Low Price: $383.90
  • Lion Gas Grill- L90000 Propane

    S&P SQD06 Direct Drive Square Inline Centrifugal Duct Fan 100W 424 CFM Single Phase - SQD601AS

    Model: SQD601AS
    Low Price: $1,078.00
    FREE SHIPPING
  • Fantech FKD 8 XL Mixed Flow Fan 837 CFM Single Phase - FKD 8XL

    Fantech FKD 8 XL Mixed Flow Fan 837 CFM Single Phase - FKD 8XL

    Model: FKD 8XL
    Low Price: $1,300.00
  • Fantech FKD 10 Mixed Flow Fan 909 CFM Single Phase - FKD 10

    Fantech FKD 10 Mixed Flow Fan 909 CFM Single Phase - FKD 10

    Model: FKD 10
    Low Price: $1,398.00
  • Fantech FKD 8 XL 230V Mixed Flow Fan 820 CFM Single Phase - FKD 8XL-230

    Fantech FKD 8 XL 230V Mixed Flow Fan 820 CFM Single Phase - FKD 8XL-230

    Model: FKD 8XL-230
    Low Price: $1,590.00
  • Lion Gas Grill- L90000 Propane

    S&P SQD8 Direct Drive Square Inline Centrifugal Duct Fan .25 HP 820 CFM Single Phase - SQD8251CS

    Model: SQD8251CS
    Low Price: $1,727.00
    FREE SHIPPING
  • Lion Gas Grill- L90000 Propane

    S&P SQD8 Direct Drive Square Inline Centrifugal Duct Fan .25 HP 820 CFM Single Phase - SQD8251AS

    Model: SQD8251AS
    Low Price: $1,755.60
    FREE SHIPPING
  • Fantech FRD 20-10 230V Rectangular Inline Fan 964 CFM Single Phase - FRD 20-10 - 230

    Fantech FRD 20-10 230V Rectangular Inline Fan 964 CFM Single Phase - FRD 20-10 - 230

    Model: FRD 20-10 - 230
    Low Price: $1,790.00
  • Lion Gas Grill- L90000 Propane

    S&P SQB08 Belt Drive Square Inline Centrifugal Duct Fan .25 HP 876 CFM Single Phase - SQB08MH1S

    Model: SQB08MH1S
    Low Price: $2,552.00
    FREE SHIPPING
  • Lion Gas Grill- L90000 Propane

    S&P SQB08 Belt Drive Square Inline Centrifugal Duct Fan .33 HP 998 CFM Single Phase - SQB08PH1S

    Model: SQB08PH1S
    Low Price: $2,600.40
    FREE SHIPPING
  • Lion Gas Grill- L90000 Propane

    S&P SQB08 Belt Drive Square Inline Centrifugal Duct Fan .25 HP 876 CFM Three Phase - SQB08MH3S

    Model: SQB08MH3S
    Low Price: $2,653.20
    FREE SHIPPING
  • Lion Gas Grill- L90000 Propane

    S&P SQB08 Belt Drive Square Inline Centrifugal Duct Fan .33 HP 998 CFM Three Phase - SQB08PH3S

    Model: SQB08PH3S
    Low Price: $2,855.60
    FREE SHIPPING

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22 Item(s)

Inline Centrifugal Fans, also known as inline centrifugal duct fans, consist of an impeller in a specially designed housing. The shape of the housing imparts a radial flow of air that spirals in the same direction as the motor shaft. This flow of air can be quite strong, and even small centrifugal vent fans can make a big difference in the ventilation of a room or building.

HVACDirect.com has an impressive selection of inline centrifugal fans from VENTS-US and S&P. Some are built with corrosion-resisting materials, including a few models that are rated for corrosive air and radon gas mitigation. Centrifugal inline fans do not have to be round. Sometimes, the ductwork makes it more feasible to install a square or rectangular fan, but the airflow is still centrifugal in nature.


Mixed Flow Inline Fans create an axial flow of air, parallel to the motor’s armature, plus a radial flow. The combination of the two creates an outflow strong enough to remove heavy, allergen and moisture-laden air from a building or room in a relatively short amount of time. You could say that the mixed flow inline fans for sale by HVACDirect.com are big brothers to the vent hood fans found in kitchens and the vent fans found in bathrooms, because they work on the very same principle.

The determining factor between what would work best for your environment - centrifugal or mixed flow - depends greatly on the ductwork and the type of activity that occurs in the room or area. Mixed flow fans work best when connected to straight runs of ductwork, so if the existing ductwork has a lot of right-angle turns in it, an inline centrifugal fan might be the best choice. For rooms or areas with a lot of “heavy” air (saturated with moisture, fumes and/or allergens), a mixed flow fan might be best.

To be absolutely certain, however, check with one of our knowledgeable customer service representatives. They can answer questions and help you find the right product for your needs.

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