Window and Door Measurement System

Testing the air permeability of window and door joints

The air tightness of outside windows and doors is an important criterion for achieving an airtight building envelope. The Window and Door Measurement System developed by BlowerDoor GmbH allows you to determine the joint permeability of building components in a simple and accurate way. On the basis of the measurement results windows and doors can be classified in accordance with EN 12207 (windows and doors, air permeabilit - classification).

The measuring principle

A foil with an orifice plate is fixed to the window to be analysed. With the Minneapolis BlowerDoor installed in the room or apartment, a pressure difference is created in the hollow space between the window or door and the foil. The foil slowly bulges inward. As soon as the hollow space is filled with air, the measurement can be started.

The airflow entering through the window joints is measured b means of an orifice plate with a defined diameter, and the pressure difference on both sides of it (Δp_Orifice). In order to evaluate the permeability of the joints, the corresponding pressure difference on both sides of the window is also measured (Δp_Window/Door). The results of the measurement can the be compared to the classifications of the EN 12207.

The measuring technology

With the Window and Door Measurement System, you can even determine the permeability of window joints following the EN 12207 at the construction site. Included in the scope of delivery are, among other items, the specially manufactured orifice plates with predefined various diameters (accuracy ± 10%), as well as the software for the measurements and a detailed instruction manual. The Window and Door Measurement System requires the laptop-controlled use of the Minneapolis BlowerDoor.

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