Notes that ventilation efficiency is not referred to directly in the new DIF standards for ventilation effciency. Reasons for this are that there are no clear definitions for the term or instructions on how optimum ventilation efficiency can be achieved under different operating conditions. Describes some measurements carried out on ventilation efficiency in non-industrial premises.

Provides basis for planning and installing plant for maintaining indoor climate based on previous draft which is based on earlier Danish Standard. Refers to several salient design criteria including leakage factors at given test pressure, maintenance of climate parameters, air quality, anticipated energy consumption. Gives example table for requirements of building in terms of m2/person depending on application. States example tolerances of air flows.

Common assumption is that tight houses cause mould. Questions this attitude and suggests that low-energy and very well insulated housing causes mould as a result of condensation. Discusses factors which cause mould and possible countermeasures.

Reports on conference arranged by AIC where main topic was different building standards in different countries. Discusses condensation problems in UK housing and frequency of toxic gases in Scandinavian housing. Notes research into more efficient ventilation and future expectations.

Notes that there is currently no generally accepted term for the efficiency of a system in terms of pollution removal. Different proposals have been suggested. There is now sufficient factual data to determine the difference inability of different systems to evacuate pollution. This is despite the factthat the requirement for minimum flow is the same for all fan-assisted ventilation. The requirement is also unrelated to whether the system is an extract or push-pull system and where the ventilation devices are positioned.

Descibes tests conducted by the Pacific Gas and Electric (PGE) and the Bonneville Power Administration (BPA) to evaluate cost effectiveness of certain retrofits. 20 houses in Walnut Creek CA underwent an air infiltration reduction program, simi

Describes measurements of the leakage area of fireplaces,bathroom and kitchen exhaust vents, electrical outlets and leakage in the ducts of forced air distribution systems. Makes component leakage measurements in a total of 34houses in Atlanta, Georgia, Reno Nevada and the San Francisco Bay area. Finds damperless fireplaces and ductwork to be the most significant sources of leakage in the western houses.

Measures houses with energy efficient designs in Eugene, Oregon and Rochester (NY) for effective leakage area using blower door fan pressurization. Determines air change rates by tracer gas decay analysis. Makes fan pressurization measurements on 13 new houses in the San Francisco Bay area that have been partially sealed with polymeric foam sealant. Measures a similar group of 13 unsealed houses as a control. Uses the results of thesemeasurements in conjunction with an infiltration model developed at LBL to predict average annual and heating season infiltration rates.

Describes a project carried out by the Bonneville Power Administration where 18 houses at its Midway substation in central Washington were retrofitted and the results monitored for a 3 year period. The houses were divided into 3 groups. During