Vaclav Posted June 3, 2020 Share Posted June 3, 2020 Hello, I am going to retrofit MVHR in 1930s semi and this also goes hand in hand with getting new windows. The question is: are windows with airtightness class 3 sufficiently airtight to allow MVHR work efficiently or do I need to get windows class 4? Any experiences? Link to comment Share on other sites More sharing options...
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