Reports recent studies showing that seasonal efficiency of oil-fired residential heating systems is in the range 55-75% compared with steady-state efficiency of 80% or more. Finds this is due to effect of off-period draughts and of excess combustion air and draught control air on the infiltration loss for the structure. Discusses ways of improving efficiency. Finds sealed combustion systems may offer operating cost savings.

Reports study of energy consumption of typical house in Texas. Computer-based model was used to simulate house under different conditions of insulation, infiltration, shading and operation. Gives tables of results of variation in energy use. Finds comparison between "wasteful" and "conservative" home. Shows 56% decrease in annual energy consumption.Concludes that energy saving measures would be cost-effective.

Describes series of wind tunnel investigations leading to development of a procedure for estimating wind pressure forces on low-rise building which is part of a large group of similar buildings. Procedure takes account of geometrical form of building, spacing of buildings, direction of wind and upstream fetch conditions. Gives estimated value as pressure coefficient which may be determined graphically.

Describes method of measuring air flow in mines using nitrous oxide as a tracer gas. Examines two methods of measuring airflow, releasing a continuous stream of a gas and releasing a known quantity of gas. Describes laboratory study andunderground tests of method. Concludes that technique is reliable and accurate.

Reports findings of a working group on health aspects related to indoor air quality. Identifies main air pollutants generated both outdoors and indoors. Considers adverse health effects of indoor pollutants. Concludes that ventilation rate is the important factor in the health concerns discussed. Finds a lack of valid health data on the indoor climate. Recommends further studies.

Gives short state-of-the-art review of knowledge of wind turbulence. Mentions results from field investigations. Summarizes available knowledge. An appendix discusses hot-wire anemometry. Gives bibliography of subject.

A bibliography of references on the subject of air infiltration, lists references in alphabetical order of author and gives short index to broad subject headings.

Chipboard is a common building construction material which continuously emanates formaldehyde. Reports measurements of concentrations of formaldehyde in 24 rooms in 23 Danish dwellings where chipboard was used for walls, floors and ceilings. Gives results in table 1 of concentrations underdifferent combinations of temperature, humidity and ventilation rate. Finds average concentration of 0.62 mg/m3 and in some rooms concentration exceeded the German threshold limit for occupational exposure. Develops mathematical model for the room air concentration of formaldehyde.

Describes experimental studies of the natural ventilation of four similar houses with different ventilating systems. Describes houses and gives experimental procedure and results of measurements of air-change-rates using hydrogen as a tracer gas.Shows variation in air-change-rates are due mainly to changes in wind speed and that wind direction and temperature difference are secondary factors. Estimates rate of heat loss as a functionof wind speed. Discusses relationship between measured pressure differences and wind speed and direction.

Briefly outlines the causes of natural ventilation which are wind and stack effect. Gives calculation of ventilation rates for a simple building. Discusses the effect of a more complex building plan.