Airtightness of residential buildings in Japan

Measures the airtightness of various types of 25 residential units (9 detached houses and 16 apartments) using the fan pressurization technique. Shows the relationship between the pressure difference across the building envelope and the volumetric flow rate of air as well as the ratio of the effective leakage area of one building element to the total leakage area. Compares the airtightness of various types of houses in different countries using the valueof the effective leakage area per floor a at a pressure difference of 10 Pa. Considers the important points in the design of ventilation systems for an airtight house.