The measuring system BlowerDoor MultipleFan consists of 3 BlowerDoor fans and 2 digital pressure gauges DG-1000 and was developed for airtightness measurements of large buildings with an envelope area of approx. 7,000 - 36,000 m² or an internal volume of up to 440,000 m³. This system also allows you to test single-family homes or apartment buildings with one or two BlowerDoor fans.  Shipment includes: 2 measurement systems Minneapolis BlowerDoor Standard / 1 BlowerDoor fan / accessory bag incl. fan cover, speed controller, BlowerDoor panel (standard size) with 2 openings, BlowerDoor panel (standard size) with 3 openings, software TECLOG MultipleFan, communication jack, 1 WLAN-N-Router (4 ports, 300 MBit/s, 2T2R), 2 premium patch cables (red, 2 m), 1 premium patch cable (yellow, 10 m), tube set, reference guide / additional upper cross bar / mounting strut short and long / 2 laptop racks / attachment: measurement device holder / sealing box for building preparation. A 4-year warranty on the entire Minneapolis BlowerDoor measurement systems is included. Optional: Calibration with DAkkS-certificate (Reduced surcharge when initial purchase)