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I want to question why the posting from Tradesman Building Supplies has been allowed to remain. It is clearly pure advertising and does not contribute in any way to discussion of the Denby Dale Passivhaus. The company's products seem to have few if any specific environmental credentials. For example their 'eco' window does not appear to go beyond building regs in performance, and does not have any form of timber certification. Their environment policy seems to rely entirely on carbon offsetting (a controversial measure in itself) with no other measures of any sort.