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.)

Good Housekeeping

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

Professional Installation
GAF Roof Wizard Virtual Home Remodeler

Product Pricing and Where to Buy