Proper ridge and soffit venting with a whole-house fan
I just installed a Cobra Snow Country Advanced continuous ridge vent. It provides two sqft of net free area. I understand that this should be balanced with an equivalent amount of soffit vents (yet to be installed) for a combined total of 4 sqft nfa. I have gable vents that I will be closing off so that I get the proper airflow from soffit to ridge. Simple enough. Now the complication: I have a whole house fan that requires 7 sqft of nfa.
So here is my question: What is the proper way to increase the nfa from 4 to 7 sqft but still achieve the proper passive airflow from soffit to ridge when the whole house fan is not in use?
I could increase the soffit venting to 5 sqft but wonder if this would upset the soffit/ridge interaction.
Or I could add 1.5 sqft of standard box vents near the ridge and increase my soffit venting the same amount for a total of 7 sqft of nfa.
Thanks for any suggestions.
By the way, i am in zone 5.