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I understand the concept being an HRV and ERV, but I don't understand what the penetration to a building envelope looks like in practice. I can't find any pictures online. Can it come in below a rim joist? Is it a vent higher on a building facade? I am designing a 2 story house but the 2nd floor will not have a floor chase so I am trying to figure out how the intakes will work. 2nd floor will be 3 bedrooms so perhaps that is the best location for the intake. Sorry for the novice questions. I have a Zender catalog but I don't fully understand how a system gets installed.