The Model 4 Minneapolis Blower Door system includes a single fan, the DG-1000 Bluetooth enabled pressure and flow gauge with Cruise Control, and the adjustable aluminum frame and nylon panel, which is suitable to test air leakage on a most residential and medium sized commercial buildings. Multi-fan Minneapolis Blower Door systems are also available (both 2 fan and 3 fan systems) to test larger buildings. Mini-fan Minneapolis Blower Door Systems that use the Duct Blaster® Fan are also available.