Describes experimental method of determining air leakage characteristics of exterior walls of a building. Method involves pressurising the building with the supply air system and measuring flow rates of outside supply air and resultant pressure differentials across building enclosure. Uses results to obtain flow coefficient and exponent for exterior walls. Checks method by results of computer simulation of a building, finding good agreement.

Reports study of air infiltration through experimental windows installed in a normal office building. Air change rate was measured using carbon dioxide as a tracer gas. Pressure drop across window, wind velocity and direction were recorded . Finds that air leakage measured was generally quite different from that which could be calculated. Postulates reason for this is complex process caused by dynamically varying pressure differential across the window, flow occurring through window in both directions simultaneously and to particular experimental configuration used.

Describes pressurization method of measuring air leakage using a fan installed through an open window. Gives results of survey of 24 houses. Humidity, meteorological parameters, indoor particulate levels, measured equivalent leakage areas and other information were recorded. Finds that tight houses tend to havehigher humidity, that leaky houses require more heating energy and that houses where smoking takes place have higher air pollution levels than others.

Reports measurements in title. House was contained in environmental chamber with control over inside and outside temperature with essentially no wind velocity. Observes familiar correlation between inside-outside temperature difference andinfiltration rate, and effect of sealing doors and ducts underconditions of negligible wind velocity. Compares different methods of collecting air samples for analysis and compares SF6 measurements with air exchange rates imposed on the house by means of a centrifugal blower.

Reports results of series of tests on 6 single-family houses to determine rates of overall leakage through windows, doors, walls and ceilings. Uses vane- axial fan to reduce pressures inside house and measure flowrate and resultant pressure differences across house enclosure. Purpose of tests was to assist in eliminating rates of air infiltration in houses.

Detailed analysis of actual space heating requirements shows a much higher consumption in mild weather than predicted. Attributes this mainly to casual window opening, which accounts for 30% of total energy used. This factor will be greater in well-insulated houses where ventilation loss is proportionately greater. Examination of motives for window opening suggests high humidity levels are most likely. The trend to man-made fibres in soft furnishings with low moisture storage capacity accentuates humidity problem.

The nomograph estimates air infiltration du to wind and the amount of heat removed by any quantity of heated air. It supplements the September HPAC Data Sheet on air infiltration into buildings due to temperature differences (stack effect)

Air movement into and out of a building is caused by pressure differences created by fans, wind, and/or differences in air density. The latter factor is called the chimney or stack effect and, generally, is due to a higher temperature inside a building than outside.

Outlines basic requirements for a fresh air supply to a dwelling, which include health, comfort and air for combustion appliances. Discusses feasibility of achieving these requirements by natural and mechanical means.

Describes experimental method used and results obtained in a series of experiments to investigate characteristics of air flow through cracks in dwellings, including the straight-through, l-shaped and multi-cornered forms found in the construction of a dwelling. Aim is to supply accurate knowledge for computer simulation of ventilation effects in a room.