The sound insulation provided by similar types of windows varies considerably. This paper describes experiments on a number of elements which affect sound insulation, including the sealing of openable panes, the type of frame material, the size of the window panes, and the spacing of panes in multiple pane systems. It identifies the main factors and lists the potential insulation values for various types of window. This paper will be of interest to architects, planners and acoustic consultants.

The issue of sound quality in offices and other occupied spaces has been of continuing interest since the 1950s. Existing assessment methods do not adequately account for the Low-frequency background sound ( < 250 Hz) produced by operating heating, ventilating, and air-conditioning (HVAC) systems, in particular, Low-frequency rumble. This paper discusses the results of ASHRAE-sponsored research in which more than 75 HVAC noise samples were collected, normalized, and categorized in terms of sound quality.

This study has the objective of applying the "age of air" concept and tracer gas techniques in the evaluation of ventilation characteristics of workplaces equipped with a general ventilation system. A Class I OK cleanroom was selected for this study and C02 was used as a tracer gas. After the tracer gas was released in the form of a pulse into the cleanroom, its concentration was measured as a function of time at various locations by non-dispersive infrared photometers. The average age of air at each location was then calculated from the C02 concentration data.

This report is one of a series giving practical advice on methods of reducing radon levels in existing dwellings. It is intended to help surveyors, builders and householders who are trying to reduce indoor radon levels by positive pressurisation. The report is based on a large body of remedial work carried out to advice from the Building Research Establishment (BRE), and on discussions with others working in the field. The measures it describes are applicable, in principle, to all dwellings and similar buildings.

This report is one of a series giving practical advice on how to reduce indoor radon levels in existing dwellings. Its specific subject is radon remedial measures for houses with suspended timber floors. These measures can also be used with other types of suspended floor, although they are not relevant to timber finishes laid directly onto concrete bases. The report is aimed at builders who carry out radon remedial work and householders who are competent at D IY.

This report is one of a series giving practical advice on methods of reducing radon levels in existing dwellings. It deals specifically with dwellings, and supplements the general guidance given in The householders' guide to radon 1, obtainable from local environmental health officers or from the Department of the Environment. This report offers advice on radon-protective measures that can be taken during the planning and implementation of major alteration or conversion works to a building in radon-affected areas.