Is it a scam to charge for an engineering blueprint and scope for an AC ductwork and not use it? Then provide an excuse for not including dampers because dampers are for business units? Also not setting ductwork layout according to the engineers blueprint plan. Ductwork was changed because of excessive mold found. Also, mechanic did not change the moldy plenum that was paid for until 1 week after new ducts were in place. Will this cause mold to grow in the new ducts.