At the top level of the Building Tree, in the Misc tab, you can select from a variety of different ventilation cooling systems, including a Whole House Fan. Once the type of ventilation cooling system is selected, at the System level of the Building Tree, in the Residential tab, input the total CFM for your fan, along with the total wattage. Note that the CEC maintains a list of approved whole house fans with specifications on their website.
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