Air volume:    1 - 32000 cfm
 Maximum SP: 5" wg. @ standard air density


  • Two full size access doors provide easy access to the wheel and motor
  • Wheels are backward inclined, non-overloading
  • Speed Control allows for field adjustment and system balancing
  • Thermal overload protection (single phase)
  • Electronically Commutated Motor (single phase)
  • Fan Speed Control for ECM manual control or 0-10V control
  • Aluminum wheels
  • Housing is galvanized steel construction or stainless steel construction (VSIFDD-SS Models)
  • Disconnect Switch Standard
  • Side discharge options
  • Units can be installed at a 90 degree rotation
  • Unit can be installed horizontally & vertically
  • Mounting Brackets Standard
  • 2" NPT threaded drain included with sizes 11-36 Stainless Steel Versions, 1" NPT threaded drain used on sizes 9-10


  • Floor Vibration Isolators
  • Ceiling Vibration Isolators
  • Back Draft Dampers
  • Motorized Back Draft Dampers
  • Discharge Screen
  • Square Duct Inline Connectors
  • Inlet Rings For Round Duct
  • Side Discharge Left
  • Side Discharge Right
  • Low Pressure Square to Round Discharge Adapter




Ventilation Direct certifies that Models VSIF11DD thru VSIF36DD are licensed to bear the AMCA seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 211 and 311 and comply with the requirements of the AMCA Certified Rating Program.

Models VSIF11DD thru VSIF36DD have been certified by ITS. This certification mark indicates that the product has been tested to and has met the minimum requirements of a widely recognized (consensus) U.S. products safety standard, that the manufacturing site has been audited, and that the applicant has agreed to a program of periodic factory follow-up inspections to verify continued performance.

Models VSIF11DD thru VSIF36DD are ETL Listed under report number 3100959CRT and comply with UL705 and CSA C22.2, No. 113 Standards.

Models VSIF11DD thru VSIF36DD with Stainless Steel Construction comply with UL705 and CSA22.2, No. 113 and ULC S645 Standards.

Catalog #110F
May 2021
Ventilation Direct is committed to customer service and on time, accurate delivery of superior Ventilation products.

Call 1.866.433.8335 for a friendly customer service representative that can customize your exhaust fan, heater or supply air package while providing you a fast quotation including drawings and submittal packages. Our product line includes UL and ANSI listed commercial and industrial exhaust fans, heaters, make-up air units, motors and more with a two year warranty.