Passive Air Control
Hygiene Analysis

Passive Air Control

    The Passive Air Control Test (also called the PHCT or Passive Air Exchange Test) is often used to evaluate the tightness of the building envelope. This test is essential for increasing a building's energy efficiency, improving indoor air quality and reducing the risk of structural damage. Building sealing can reduce heat loss and save energy by improving indoor air quality.

    The Passive Air Control Test is usually done in conjunction with or independently of a "blower door test". However, the blower door test is an active test (i.e. a test done by creating different pressure levels inside and outside the building), while PHCT is a passive test.

    The Passive Air Control Test includes these steps:

    1. **Preparation:** All windows, doors and other openings are closed. Mechanical ventilation systems and fireplaces are sealed or sealed.

    2. **Measurement:** The difference between the air pressure inside and outside the building is recorded over a given period of time (usually several hours).

    3. **Analysis:** The recorded pressure difference data is analyzed. This is used to determine the sealing level of the building.

    4. **Conclusion:** According to the results of the analysis, the sealing level of the building envelope is evaluated and necessary improvements or corrections are suggested.

    The Passive Air Control Test is used to determine how the building is performing in real world conditions. Therefore, it is an essential tool for energy auditors, building designers and contractors. However, the results of this test may not provide a complete picture of building sealing. For this reason, it is usually recommended to do it together with other tests (eg blower door test).