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 ISO 9972 (Method 1)?
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 positive 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.
In general, the positive and negative pressure values n50 are relatively close to each other. If there are significant differences between the two results, a plausible explanation should be given in the measurement report.
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