Whole House Fan

Modified on Fri, 6 Sep at 12:03 PM

Whole House Fan Library Help

A whole house fan is a type of cooling fan, commonly venting into a building's attic, designed to pull air out of a building and draw in cooler outdoor air through windows and other openings. In Ekotrope, we support modeling whole house fans that are located in the vented attic to provide air circulation during favorable outdoor conditions. Whole house fans are assumed to be running on two different fan modes: High speed and Overnight (or low) speed. Generally, when the outdoor temperature gets cooler during the evening hours, the whole house fan will run on high speed for the first hour. After that, if the outdoor conditions are still favorable to further cool the house, the whole house fan will run on low speed until the morning.

Fan CFM	Enter the fan airflow rate in CFM [Cubic Feet / Minute] for the high and overnight speed modes.
Fan Watts	Enter the fan wattage for the high and overnight speed modes.
Fan Cover R-Value	Enter the R-value of the penetration to the primary thermal boundary, which whole house fan ventilation passes through. For example, for ducted whole house fans installed in a vented attic, enter the overall R-value of the damper/grill between the attic and the conditioned space. You may provide different values for the heating (winter) and cooling (summer) seasons. If the monthly average temperature is above 60 degrees Fahrenheit, it is categorized as the cooling season; otherwise, it is the heating season.
Fan Opening Area (s.f.)	Enter the area of penetration in the primary thermal boundary for the whole house fan air flow. For example, for ducted whole house fans installed in a vented attic, enter the damper/grill opening area in square feet.
Manufacturer	Enter the name of the manufacturer of the whole house fan. This input is mandatory in Ekotrope.
Model	Enter the model number of the whole house fan.