Calibration of BlowerDoor Fans
The calibrations are conducted by an accredited lab and based on their traceability to national standards (EN 17025) provide maximum accuracy. Per flow-ring (open fan and rings A-E or 1-4), the calibration includes testing three values each in the lower, mid-level and upper flow-rate measuring range in a chamber test stand at a pressure differential of 50 Pa. The manufacturer recommends the calibration of BlowerDoor fans every four years.