How to get a blower door certified involves both equipment certification and personal certification to perform code compliant tests. For equipment, blower door manufacturers like Minneapolis Blower Door and Retrotec calibrate fans and gauges annually, you must send your DG-1000 or DM32 gauge and fan to factory or authorized lab for calibration, cost $200 to $400, and they issue calibration certificate required by RESNET and building codes to prove accuracy. For personal certification to legally perform blower door tests for code compliance, you need to become certified as a BPI Building Analyst or RESNET HERS Rater. Path typically includes taking a training course from accredited provider, 3 to 5 days classroom plus field training costing $1500 to $3000, learning building science, air sealing, blower door and duct blaster operation, combustion safety, and energy modeling. Then pass written and field exams. Once certified, you must maintain certification with continuing education every 3 years. You also need to follow ANSI RESNET standard 380 for testing procedures. Many states also require you to be listed as approved third party tester with local code office. So certification is twofold, calibrate equipment yearly and get and maintain professional credential.
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