I have a cape cod style home, pictured below. The second story living space on the back side of the home is created by having a lower pitched roof. So, the front and back sides of the roof have different pitches. I have large eaves overhanging the exterior walls with plenty of soffit vents already installed. I recently found that these soffit vents on the lower level were rendered useless when I discovered that the space formed between the roof sheathing and the sloped interior wall was stuffed with insulation. I plan on placing baffles in those spaces to allow the colder air to be pulled into the attic space above the second floor living area.
I currently have 8 soffit vents; four in the lower eave which is the floor of the knee wall space, and four in the eave of the second floor, along with a ridge vent to be installed with a new roof coming in a month or so. My calculations call for me to add 2 more soffit vents in order to balance the system, 6 if I want to go 60/40 intake/outtake. Installing the additional soffit vents in the lower eave is obviously much more attractive to me and with that in mind this is my question:
Will the air pull from the second story eave vents more so than the lower level vents? Do I need to take this into account when making my decision? The last thing I want to do is to go through all this work only to short-circuit the system and have little air pulled through the knee wall at the front of the house.