We are the blower door test experts

for buildings from XXS-XXL

Over 25 years specialists in airtightness measurements on buildings and rooms of all kinds.
Fan performance of our calibrated fans = 551,000 m³ volume flow at 50 Pascal.

Blower door test up to 5.500.000 m³

Why Blower Door XXL?

Our services for your project

  • Industrial halls, production buildings
  • Office buildings, non-residential buildings
  • Cold stores, deep-freeze halls
  • Logistics halls, forwarding building
  • Gymnasiums, sports halls, fitness studios
  • hypermarkets, supermarkets
  • Fun pools, indoor pools
  • Single and multi-family houses
  • Retirement homes, passive houses
  • 1st world record holder: largest blower door test with Guinness Book entry
  • First successful measurement in 1996
  • over 10,000 successful measurements
  • Several DGNB projects
  • Cost advantage due to the strongest measuring devices
  • We operate internationally
  • Certified measurement according to DIN EN ISO 9972
  • Airtightness serves to preserve value
  • Construction support from planning to implementation
  • Blower Door Test Measurements also at the weekend or at night so as not to block the construction site
  • Holding time calculation of gas extinguishing systems certified according to NFPA, ISO, EM and based on VDS
  • Leak detection via thermography, hot-wire anemometer or fog
  • Checking the airtightness of buildings

Measurement after and for:


Wir sind Sponsor der HighlandGames 2023, die am 17. und 18. Juni im Waldstadion des VfL Lüerdissen stattfinden.

Weitere Informationen finden Sie unter:


Insert Image