Benefits of Whole-House Fans:

• Efficient, cost-effective cooling
• Can cut summer air conditioning costs and create a more comfortable living environment
• Exchange air much more rapidly than air conditioning units, allowing faster cooling of the interior
• Draw cooler air indoors, especially when used at night and early morning hours
• Extract heat from objects within a house, such as appliances, furniture and walls

Design Considerations:

• For maximum effectiveness, a whole-house fan must be sized correctly for the structure it is required to ventilate.
• The formula to follow for determining capacity is: square feet of living area x 3 = CFM (cubic feet of air moved per minute) required.
• Because whole-house fans exhaust hot air into an attic, a properly sized attic ventilation system is required to exhaust heated air from the attic to outdoors.
• To determine the net free area of attic ventilation required, use the following formula: CFM rating of fan divided by 750 = square feet of net free exhaust area.
• Failure to provide this venting will reduce the fan's airflow capacity. In addition, it will lead to noisy operation and ultimately failure of the fan motor.
  
  

  Belt-Drive Fans
 Thanks to a motor mounted just above and to the side of the fan, a belt-drive whole-house fan provides for smooth, quiet operation.

  Direct-Drive Fans
 Direct drive whole-house fans are easy to install since no attic joists need to be cut. They feature a pull chain for easy operation.