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Tack! (mina tankar gick först till värmeväxlare med roterande skiva, sådana finns!) http://www.lff.goteborg.se/prod/lff/dalis2.nsf/vyFilArkiv/flik%204%20VVS.pdf/$file/flik%204%20VVS.pdf 4 KudoZ points were awarded for this answer