Product Brochure
29
Accessories/Replacement 
Parts For Whole House Fans
WHT36 Timer & BWS2 Switch
29
Master Flow
®
 Belt Drive Deluxe Whole House Fan
Master Flow
®
 Direct Drive Standard Whole House Fan
Accessories/Replacement Parts For Whole House Fan
PRODUCT SPECIFICATIONS
Drive 
Type
Model 
Number
Size HP CFM For Homes 
Up To 
(sq. ft.)
Ltd. Warranty 
Term/ 
Labor Protection 
Plus Plan*
Belt 30BWHFS 30" 1/3 6000 3000
10 yrs./ 
5 yrs.
Drive 
Type
Model 
Number
Size HP CFM For Homes 
Up To (sq. 
ft.)
Ltd. Warranty 
Term/ 
Labor Protection 
Plus Plan*
Direct WHFS24M 24" 1/4 4500 2500
10 yrs./ 
5 yrs.
Model 
Number
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
Motor 24DD 24" Direct drive replacement motor
Motor 30BD 30" Belt drive replacement motor
• Efficient... 
1
/
4
 hp permanent split capacitor design 
• Convenient Operation... 2-speed pull chain switch controls  
operation (no wiring through walls required)
• Great Appearance... Includes super-quiet automatic white 
ceiling shutters
Master Flow
®
 Direct Drive  
Standard Whole House Fan
WHFS24M (Direct Drive)
Note: Master Flow
®
 Whole House Fans are designed for homes over 1,000 square feet.
Note: Requires at least 1,152 in² of attic exhaust ventilation net free area.
Note: Requires at least 1,008 in² of attic exhaust ventilation net free area. 
 Note: Always have a balanced attic ventilation system. The amount of exhaust ventilation should NEVER exceed the amount of 
intake ventilation.
 *See Master Flow
® 
Powered Ventilation Products Ltd. Warranty for complete coverage and restrictions.










