Frequently asked questions on airtightness

TightVent Europe’s website includes a page dedicated to providing answers to commonly asked questions regarding building and ductwork airtightness. Please visit and learn:

  • What is building airtightness?
  • What is ductwork airtightness?
  • What is infiltration/exfiltration?
  • What is the energy impact of building and ductwork airtightness?
  • Is there experimental data showing the energy savings of good building airtightness?
  • Is good building airtightness compatible with good indoor air quality?
  • What is an adhesive, a grommet, a vapour barrier, etc.?
  • Are there groups of airtightness testers?
  • How is the building airtightness quantified?
  • How is the ductwork airtightness quantified?
  • Are there databases on building and ductwork airtightness?
  • What are relevant CEN standards related to ductwork & building airtightness?
  • Is there on-going research in relation to durability of airtightness?
  • What is the relationship between pressure and leakage air flow rate?
  • What are the most common air leakage/infiltration paths?
  • How do you design for airtightness?
  • What is an air barrier?
  • Is building and ductwork airtightness testing mandatory?
  • What is a Blower Door?
  • What is an airtightness/air leakage testing? What is fan pressurization?
  • What does n50 mean?
  • What are the impacts of poor envelope airtightness on ventilation, indoor air quality and building damage?
  • What is the impact of duct leakage on comfort, ventilation, indoor air quality and fire security?

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