Code ventilation requirements.

The 1995 edition of the National Building Code of Canada has extensively changed the ventilation requirements for housing. The code includes detailed prescriptive requirements, because in the past ventilation system design and compliance has varied. In this piece we are focusing on the new requirements in the National Building Code. These requirements apply in all areas except for Ontario and B.C. where provincial requirements were modified several years ago, and will be continued with only minor modifications.

Reentrainment of pollutants from exhausted air - discussion of different types of regulatory requirements.

In many existing ventilation systems unintentional reentrainment of pollutant, due to improper location of exhaust and air intake, decreases quality of indoor environment. Unfortunately, the more precise method of assessment of exhaust plume behaviour, the more difficult potential application in regulatory codes and standards. The aim of the paper is to discuss advantages and disadvantages of different types of the models and their applications in regulatory requirements.

The case for the Q-value.

Clients, designers and institutions are all calling for more airtight buildings. Do we need mandatory pressure tests backed up by compliance procedures in Part L, or simply the publication of good practice guidelines? A recent CIBSE workshop delivered some answers.

Air change rates in non residential buildings in California.

This report describes results from the first group of field measurements of the air change rate in 49 nonresidential buildings in the Stale o"f California. The air change rate measurements were made using a tracer gas method. Procedures were based on protocols developed in ''Protocol for Measuring the Air Change Rate in Non-residential Buildings." Purpose of the tests was to obtain preliminary data for determining the effect of the various California Energy Codes on the air change rates in non-residential buildings.

Protocol for measuring the air change rate in non residential buildings.

This report describes various measurement protocols to be used in the measurement of air change rates in non-residential buildings. The measurement protocols are based on the use of tracer gas techniques.

Checking the performance of ventilation systems.


Putting pressure on building codes.

House depressurization is a ubiquitous, dangerous problem. As regional mechanical codes move toward consolidation into one International Mechanical Code, now is the time to add a performance testing requirement for house depressurization.

Appraisal of the regulations governing the use of gas powered domestic appliances having consideration of NOx emissions.

Domestic gas apparatus generate oxides of nitrogen (NOx), which have been classed in recent years as problem products in the context of indoor air quality (IAQ). These, together with carbon monoxide which may also be present in the products of gas combustion, mean that the formulation of regulations for health protection presents complex problems. The present work shows the importance of this matter and presents interesting case studies taken from the Basque Country and our area of influence. It also makes specific recommendations as to how existing regulations should be changed.

Ventilation requirements in non-domestic building and energy efficiency.

The research community as well as the design and construction practice is spending a lot of efforts and investments in developing systems which optimise the energy use for achieving certain specified air flow rates. For example, improvements in efficiencies of 10 % in heat recovery systems would be considered as remarkable. At present, one observes a tremendous difference in the ventilation requirements in various countries as well as at the European level.