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This website has the following in the web site, "Airtight buildings, air tight, health, indoor air quality, energy efficiency." Our analyzers analyzed that the web site also stated " Airtightness in Dwellings - Prepare to be Sick in your Airtight Home." The Website also stated " Is Tight Right for British Homes? Airtightness is not fail - safe;. Appalling MVHR installation quality has been identified;. 80 of the single-family houses monitored in Sweden did not meet minimum ventilation requirements;. A field survey of heat recovery vent." The website's header had Airtight buildings as the most important search term. It was followed by air tight, health, and indoor air quality which isn't as ranked as highly as Airtight buildings. The next words they uses is energy efficiency.