MasterFlow Vents - MasterFlow Whole House Fans

Master Flow® Whole House Fans

Master Flow® Whole House Fans are smart energy savers for any climate where air conditioning costs are a concern. They allow you to beat the heat by forcing hot air out of your home while bringing in cooler outside air. Master Flow® Whole House Fans are an important part of a complete home ventilating system! (Designed for homes over 1,000 square feet.)

Master Flow® Belt Drive Deluxe Whole House Fans

  • Superior Air Exchange (versus standard models)...
    For maximum impact on cooling costs
  • Quieter Operation...
    Belt drive isolates motor noise and vibration
  • Efficient, Longest-Lasting Motor...
    1/3 hp permanent split capacitor design for added power and longer life
  • Better Appearance...
    Includes super-quiet automatic white ceiling shutters
  • Convenient Operation...
    Includes two-speed wall switch (rather than pull chain)
  • Safe...
    U.L./U.L. Canada listed
Belt Drive Listed UL


  • Efficient, Long-Lasting Motor...
    1/4 hp permanent split capacitor design
  • Easier To Wire...
    2-speed pull chain switch controls operation (no wiring through walls required)
  • Better Appearance...
    Includes super-quiet automatic white ceiling shutters
  • Safe...
    U.L./U.L. Canada listed
Direct Drive Listed UL

Master Flow® Tandem Whole House Fan


  • Easy Installation...
    Easily installed on all standard joist centers, no joist cutting needed
  • Simple to Operate...
    2-speed operation with remote control
  • Great Looking...
    Virtually invisible in the ceiling
  • Safe...
    Tested and approved by ETL for US and Canada
Tandem Whole House Fan

Accessories/Replacement Parts For Whole House Fans
Part Description
S24 24" white shutter (Fits WHFS24M)
S30 30" white shutter (Fits 30BWHFS)
BWS2 Two-speed fan control switch with cover plate (included with all belt drive models)
WHT36* 12-hour timer

*Available Only for belt and direct model

WHT36 timer and BWS2 switch

Drive Type Model No. Size HP CFM For Homes Up To: Recommended Exhaust Vent. (Net Free Area in Sq. In.) Ltd. Warranty Term/ Labor Protection Plus Plan
Belt 30BWHFS 30" 1/3 6000 3000 sq. ft. 1152 10 yrs./5 yrs.
Direct WHFS24M 24" 1/4 4500 2500 sq. ft. 1008 10 yrs./5 yrs.
Tandem* WHFTAN1 16" x 24" 1/15 1600 2500 sq. ft. 800 5 yrs./2 yrs.

†See Master Flow® Powered Ventilation Products Ltd Warranty for complete coverage and restrictions

*Requires a minimum of 500 sq. ft. of attic space to operate


All documents are U.S. English unless otherwise noted

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