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We tend to get focused on products instead of systems when we're trying to solve our problems. Unfortunately, there is never a silver bullet or a simple answer to most home performance challenges.
Here's why the spot ventilation and switching HRV/ERV products out there won't properly ventilate in most airtight homes out there: they don't create a reliable pressure imbalance within the home, which you need in airtight homes because you can't use one-way exhaust fans (https://www.youtube.com/watch?v=lnOCAPPVT5g) except in the kitchen (https://www.youtube.com/watch?v=36eMZNyAlGY).

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