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Airtightness test


In addition to heat loss through the building envelope, leaks can cause moisture to penetrate structural members at points. This presents a considerable potential for damage. Aimed at saving energy and preventing damage, the requirement for airtightness of building envelopes is an integral part of the generally recognised technical rules and is incorporated in construction law (DIN 4108-7, EnEV).

The blower door equipment permits non-destructive testing of the airtightness of the building envelope. Leaks are detected from the inside of the building by applying of reduced pressure (typically 50 Pa) thus accurately localizing construction faults in airtightness. By applying overpressure and, for example, with the help of fogging, it is possible to find out if defects leak air to the outside.

Manufacturer / Device type:

The Energy Conservatory / pressure gauge DG 700E.G + ventilator model type 4.1

Device specifications:

DG 700E.G (measuring range -1250 Pa to + 1250 Pa)

Ventilator (measuring range 19m3/h 7,200 m3/h at 50 Pa)

Measurements according to DIN EN 13829,

MultipleFan measurement with up to 12 parallel blowers, air volumes up to approximately 85,000 m³/h.

PC software:

Tectite, Tecloc