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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
by colanderman 8y ago
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.
- toomuchgov 8y agoWhat is the make/model of your ERV?
- colanderman 8y agoIt's a window unit: http://www.purifresh.com/erv.html 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 http://www.purifresh.com/cleanroom.html They can be linked (as http://www.purifresh.com/freshairsystem.html http://www.purifresh.com/freshairsystem.html) or used separately. (Apparently this is out-of-stock and being redesigned.)
- saalweachter 8y agoMy vague understanding is that negative pressure in a house is also how you get radon gas.