Note: These values are for the center of glass only. They must only be used to compare the outcome of various glazing styles, not to match whole window goods. Frame choice can drastically have an affect on efficiency. These values stand for double glazing having a one/two″ air gap. Secondary https://contemporary-pendant-ligh24211.get-blogging.com/35286068/not-known-factual-statements-about-secondary-glazing-london