Hello again, here is a report from the house building firm, first he laughingly wrote, I should move to where the firm is, in the North of Sweden they had +3 degrees yesterday!I will stay put,this man was the Technical Chief and explained that there is a filter for the incoming air, which prevents dust and other larger particles to come through, however, there is nothing in the warmth/ventilation system to stop us opening the windows, there can as many wrote on this thread, be dust and dirt, and some insects coming in, but there is no technical reason why we cant open them. As I dust (occasionally)I think I am allowed to open, but to be on the safe side, when I am on my own! We live in the country so the air is clean, it will be insects getting through I suppose, but fresh air too. Thank you all again for your comments and suggestions, I have enjoyed this thread, I am now going to open a window!!
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