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This web site states the following, "Passive Houses and low-energy buildings! Needs to use better." We noticed that the web site also said " Ventilation systems with heat recovery." It also said " First certified decentralized ventilation system with heat recovery now in Bulgaria. Is the first decentralized ventilation system, which was certified by the Passivhaus Institut PHI during the international conference in Aachen 2014 . It has an extremely high degree of heat recovery 87." The header had passive house products as the highest ranking optimized keyword. It is followed by components, passive house, and ventilation system which isn't as ranked as highly as passive house products. The next words products.passivehousebg.com uses is vacuum insulation. Zehnder was included and will not be seen by search parsers.