What equipment is needed for a blower door test?

What equipment is needed for a blower door test includes several specialized components that work together to measure air leakage. The main equipment is the blower door system itself, which includes a calibrated variable-speed fan capable of moving large volumes of air, typically 3000 to 6000 cubic feet per minute, a adjustable frame that fits into an exterior door opening, and a fabric or nylon panel with hole for fan that seals door opening. Second, a digital manometer or pressure gauge with two channels to measure pressure difference between inside and outside and to measure fan pressure to calculate airflow, modern gauges like DG-1000 or Retrotec DM32 have high accuracy. Third, tubing to connect gauge to outdoors and to fan. Fourth, software or charts to convert fan pressure to cubic feet per minute at 50 pascals and to calculate air changes per hour. Additional helpful equipment includes smoke pencils or infrared camera to locate leaks during test, tape and tools to prepare house, and combustion safety equipment like carbon monoxide detector. For code compliance, equipment must be calibrated annually and test must follow ANSI RESNET standard procedures.