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--- planning:airtight_construction:general_principles:blower_door_test [2015/09/14 18:22] – [Background: German legal requirements] wfeist
+++ planning:airtight_construction:general_principles:blower_door_test [2019/01/02 10:28] (current) – [See also] cblagojevic
@@ Line 14: / Line 14: @@
 ===== Air pressure test =====
-The **air pressure test**, or the  **n<sub>50</sub>-value** measures the total leakage through the building envelope. The n<sub>50</sub>-value (in h<sup>-1</sup>) describes the air changes at a  differential pressure of 50 Pa. A differential pressure of 50 Pa (equivalent to 5 mm water  column) is created between the inside of the building and the outside by means of a blower door test. The blower door consists if a compressor  built into an opening in the envelope (e.g. a door) creating underpressure inside the building in order to detect leakages. The actual test involves a series of underpressure and overpressure measurements determining the leakage rate at a differential pressure of 50 Pa in relation to the overall building volume. Blower door tests are offered by competent engineering firms in many countries (for German providers go to [[http://www.flib.de/|www.flib.de]]). An air pressure test is essential for Passive Houses - it is part of the certification procedure.\\
+The **air pressure test**, or the  **n<sub>50</sub>-value** measures the total leakage through the building envelope. The n<sub>50</sub>-value (in h<sup>-1</sup>) describes the air changes at a  differential pressure of 50 Pa. A differential pressure of 50 Pa (equivalent to 5 mm water  column) is created between the inside of the building and the outside by means of a blower door test. The blower door consists if a compressor  built into an opening in the envelope (e.g. a door) creating underpressure inside the building in order to detect leakages. The actual test involves a series of underpressure and overpressure measurements determining the leakage rate at a differential pressure of 50 Pa in relation to the air volume V<sub>n50</sub>. Blower door tests are offered by competent engineering firms in many countries (for German providers go to [[http://www.flib.de/|www.flib.de]]). An air pressure test is essential for Passive Houses - it is part of the certification procedure.\\
  \\
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 ===== The Passive House =====
-Much better values are often achieved for Passive Houses: n<sub>50</sub> leakage rates **may not be greater than 0.6 h<sup>-1</sup>** in Passive Houses. In fact, values between 0.2 and  0,6 h<sup>-1</sup> were achieved with built Passive Houses.\\
+Much better values are regularly achieved for Passive Houses: n<sub>50</sub> leakage rates **may not be greater than 0.6 h<sup>-1</sup>** to comply with the certification criteria. In fact, values between 0.2 and  0,6 h<sup>-1</sup> were achieved with built Passive Houses.\\
 \\
 |{{ :picopen:typical_airtight_passive_houses_mit_logo_.png?400 }}|
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 and the  EnEV requirements. Nowadays, if one wishes to build a\\
 house, attention should be paid to a high level of airtightness\\
-- because trying to improve the airtightness afterwards is very\\
+- because trying to improve the airtightness afterwards is much more\\
 difficult and only possible during the course of a full\\ refurbishment.**//|\\
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 [[planning:airtight_construction:airtightness_measurements_in_passive_houses|]]
+[[planning:building_services:ventilation:differentiation_between_vv_and_vn50_values| Differentiation between Vv and Vn50 values]]