Is the air tightness measurement protocol complete? This can be easily confirmed using this checklist:

• Is all general information included?
  • Tester: name, address and signature
  • Object
  • Date of test
  • Device
  • Measurement standard (norm)
  • Inside and outdoor temperatures
  • Wind velocity
  • Flow coefficient Cenv
  • Leakage coefficient CL
• Is the airtightness measurement performed in accordance with EN 13829 (Method A) or alternatively in accordance with ISO 9972 (Method 1 or 3)?
• Is room-by-room calculation of the air volume of the building included? Is the calculation correct?
• Has the installation location of the fan been documented?
• Has temporary sealing of the building envelope been recorded (sealing of outdoor air and exhaust air ducts at least)?
• Has a series of measurements at excess pressure AND negative pressure been performed?
• For each series of measurements, were 5 measuring points used at different pressure differences (highest value ± 50 Pa at least)?
• Is the flow exponent “n” between 0.5 and 1.0 (otherwise indicates measurement error due to a change in the envelope e.g. window opening)?
• Is the average value of the natural pressure difference between -5 and 5 Pa (measurement of the pressure difference before and after each measurement series)?
• Note: If the wind speed is greater than 6 m/s (21.6 km/h) OR the wind force is higher than 3 Beaufort, the stated limiting values for the pressure difference will usually be exceeded.

Recommendation: leakage detection at negative pressure should be carried out before the measurements, and any large leaks should be rectified and this should be documented.

Exception: For the measurement of tall buildings (e.g. high-rise buildings) special boundary conditions apply. Please contact your certifier or building.certification@passiv.de

Checklist: Test reports of airtightness measurements for download

Overview of the Passipedia articles on airtightness