Considers the reasons for advocating mechanical domestic ventilation. Discusses which factors provide for an optimum climate in rooms. Treats room temperature, air movement in the occupied zone, air purity and humidity, odours, noise. Illustrates how mechanical ventilation should be arranged to provide correct indoor ventilation and the different ventilation principles involved: gravity ventilation, fan-assisted exhaust ventilation and supply and extract ventilation. Illustrates typical applications of these systems to single family houses.

Reviews the development of methods and results achieved. The methods have resulted in a proposal for a Nordic test method for measuring ventilation efficiency (local air change frequency) using tracer gas techniques and measurements carried out for two different ventilation systems.

Reports on research project to study the effects of different methods of heating an office, temperature and draught conditions, ventilation efficiency and heat storage in joint structures. Gives test room digramatically and tracer gas concentration under different conditions, both during summer andwinter.

Describes a variation of the conventional tracer gas measurement technique for measuring air change rates. Gives theoretical analysis of measurement results simulated with a computer for a complex system of six rooms where natural ventilation is measured in one case and fan-arrested ventilation in thesecond. Results from computer simulation are a measure of fresh air ventilation and not of a room's total air change rate. Diagrams illustrate assumed distribution under both conditions.

Defines term `ventilation efficiency' and notes factors which determine it: air change rate and temperature, sources of heat and pollution and their locations in a room, persons, machinery etc in motion, the design and position of inlet and exhaust air devices. Gives mathematical and illustrative flow models.

The primary aim of the project is to describe and document a measurement method suitable for checking whether minimum requirements for ventilation efficiency are fulfilled after a ventilation system has been regulated. The project concentrates on occupied areas with mechanical ventilation such as dwellings,offices and schools. Excludes industrial buildings since special conditions such as ventilation rates, polluting processes and local extraction apply to these. Defines ventilation efficiency, describes equipment and measurement with CO2, N2O, SF6, Kr85.

In many buildings the incoming ventilation air causes recirculating airflow. Diagrams show typical examples. The incoming air stream enters below the ceiling level and carries air from the building with it causing air movement greater than th

Describes the use of SF6 tracer gas measurement techniques employed in airtightness and ventilation research at Princeton in terraced housing. Notes use of measurement results for constructing models describing the total adventitious ventilation in a house. Refers also to similar techniques used in research at Berkeley in single family dwellings.

Says that improvement of wall insulation and reduction of air change rates in existing buildings is the most efficient architectural means of energy conservation. Calculates that 200 gwh of heating energy can be saved per year in Hungary using this method.

The outdoor-air load in a large building uses 30-40% of the total cooling or heating energy. The report describes various ways of reducing the outdoor air-load in relation to the occupancy rate (persons/sq.m). Analysis (by computer simulation) was made of possible energy savings in a Tokyo department store through control of outdoor-air ventilation.