Blower Door

The Blower Door test (also known as air pressure leakage testing) is an internationally accepted test procedure according to DIN EN 13829. The objective is to check the building regarding to an inadvertent air exchange between in- and outdoors or between the individual rooms.

With the Blower Door test it is possible to detect

  • leakages
  • inadequate insulation

in the building envelope and to determine the air exchange rate (n50).

How does the Blower Door test work?

We use a Blower Door measurement device, which consists of a frame that is placed in the door or window opening and a high-performance fan to create the differential pressure. The frame is covered by a blanket (red colored in the picture) to seal the door opening airtight. Special measurement instrumentation is documenting the pressure difference during the test.

In the beginning of the measurement an under- or overpressure is created in the building. This helps to locate the leakages and to calculate the air exchange rate (n50). The air exchange rate indicates how often the air volume of the building is exchanged at a constant pressure of 50 Pa.

Blower Door measurement device ready for the test
Blower Door measurement device ready for the test

Reasons for a Blower Door test

The Blower Door test is used to verify the airtightness of a building.

A high airtightness means

  • a lower energy loss
  • a reduction of the risk of structural damages and mould formation resulting from high humidity
  • a constant comfortable temperature
  • no efficiency loss of the ventilation system
  • a good noise protection

The Blower Door test is possible in the inhabited or uninhabited building. After the measurement procedure you’ll get documentation with the results.

You are interested in a Blower Door test or need more information? Contact us!

Procedure of the Blower Door test

Here you see how a Blower Door test is executed.

Blower Door measurement device is placed
Blower Door measurement device is placed

The Blower Door measurement device is placed into a door or window frame. A high airtightness is very important at this procedure.

Apertures are closed airtight
Apertures are closed airtight

All apertures are closed airtight. Ventilation shafts are closed with a bladder.

Air volume and air exchange rate are determined
Air volume and air exchange rate are determined

With the measurement device the circulated air volume and the air exchange rate are determined. Additionally the direction of airflow can be defined with the smoke generator.

Leackages become visible
Leackages become visible

Leackages become visible and can be defined more detailed with the thermography camera.

What is a Blower Door test?

The Blower Door test is a procedure to check a building for inadvertent air exchange (air leckages) between the inner building envelope and outdoors and to localize them. Also individual rooms or parts of the building can be evaluated.

Why should I order a Blower Door test?

To gain an optimal comfortable indoor environment and to minimize the necessary energy for that. Besides this it is needed as confirmation for Development Loan Corporation credit.

Why should a building be preferably airtight?

According to § 6 of the german EnEV (2014), a building owner is obligated to build permanent air tight. That means the whole building envelope has to be as air tight as a masoned and plastered wall. The purpose of this is to save energy. Decreasing the loss of warm (or cooled) air also reduces the heating requirement, to achieve the desired temperature.

Why should I order a Blower Door test, if I am occupying the building already?
  • Air tightness means no unnecessary energy loss by thermal loss
  • A leakage generates draughts
  • There could be a condensation within the insulation plane
  • An increasing moisture penetration can happen
  • Increasing loss of the insulating effect
  • Mold formation in the rooms and for this reason an impairment of healthy
  • Moisture damages in brickwork and timbers
How is this test executed?

The Blower Door measurement device is placed into a door or window frame. Additional locations, where air can pass off, like elevators or open pipes are closed previously. While the measurement the air exchange rate is determined with the help of over- and underpressure.

What measured values are determined with the test?

The measured values are represented corresponding international standards. The air exchange rate [1/h] n50 at a pressure difference of 50 Pa is determined.

What costs a Blower Door test?

It depends on the interior volume of the building. Please call us, we will send you an offer without any obligations, verified for your requirements.

Are there reference values for the measurement that have to be observed?

Yes, there are reference values. Airtightness is state of the art since DIN V 4108-7 (11/1996) and after the publication in the Bundesanzeiger no. 140 from 31.07.1998 acknowledged rule of technology of Heat Insulation Ordinance 95. The unrequested execution of airtightness by fabricator and construction supervisor is provided.

Your contact

Boris Rieken
Boris Rieken

Tel.: +49 4222 - 805 805 0
E-Mail: rieken@syswe.de

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