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A comment on Ask HN: Do I place the fan so that it blows air inwards or outwards?. Parent comment

Re:Ask HN: Do I place the fan so that it blows air inwards o... by colanderman on Monday May 28, 2018 @10:48AM (#17172681)
Same applies for house fans -- you want the intake fan to be slightly stronger than the exhaust fan. Else the negative pressure will draw outside air in through cracks and all the fun smells that come from those places.

(I have a combination energy recovery ventilator/HEPA filter that has has a restriction filter on its exhaust for this reason. Else it would just suck crappy air in from the basement instead of fresh air through the filter.)

If you have to choose one, choose an intake fan for this reason. Best if you can leave another window slightly ajar.

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Re:Ask HN: Do I place the fan so that it blows air inwards o... by saalweachter on Monday May 28, 2018 @01:15PM (#17173536)
My vague understanding is that negative pressure in a house is also how you get radon gas.
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Re:Ask HN: Do I place the fan so that it blows air inwards o... by toomuchgov on Monday May 28, 2018 @12:01PM (#17173114)
What is the make/model of your ERV?
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Re:Ask HN: Do I place the fan so that it blows air inwards o... by colanderman on Monday May 28, 2018 @12:51PM (#17173400)
It's a window unit: http://www.purifresh.com/erv.html It's the only such kind I could find when we were in the market a few years ago. (Was renting a place with mold issues.) Works well for a single room. It's wonderful to pull fresh air in during the winter.

We also have its accompanying HEPA unit: http://www.purifresh.com/cleanroom.html They can be linked (as http://www.purifresh.com/freshairsystem.html) or used separately. (Apparently this is out-of-stock and being redesigned.)

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