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Re: Attic Ventilation
Daniel,
If the garage/shop attic is connected to the house attic, yes, definitely some problems could occur.
The whole house fan will first and foremost violate the separation required between the garage and the house (you would need to install a wall with 1/2" gypsum board on it separating the house attic from the garage attic to maintaining the separation which should be there now).
Secondly, the whole house fan will be exhausting air from the garage/shop and all the contaminates (particulates and vapors) produced in the garage/shop into the attic while pressurizing the attic. This means that all of those contaminates will be forced into the house space, which is not pressurized (the house will be at a lower static pressure than the attic, meaning that attic air will be driven into the house).
The above action will pressurize the house as compared to the exterior, thus driving the condition air within the house through the walls and outdoors.
I really cannot think of anything good you would be doing by adding that whole house fan.
If you want to exhaust air from the garage (ventilate the garage), then install an exhaust fan from the garage to the outdoors and add sufficient outdoor air intake into the garage so as to not depressurize the garage, thereby sucking air from the house into the garage.
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