There are several ways to get a Minneapolis Blower Door calibrated including a DIY option. One method is to send the fan unit back to the factory for calibration. It is suggested that an energy auditor or rater should contact the factory prior to sending the fan unit in and so here is the web address for more information: http://energyconservatory.com/
A much less expensive and also reliable calibration method is to calibrate the fan unit yourself. A short course on how to do this will be posted on this EnergySmartInstitute.com website soon.