The field performance of partially open dual glazing.

During an extensive programme of sound insulation tests on a house near Manchester Airport the opportunity was taken to measure the field performance of partially open dual glazing. The results show an increase in insulation of up to 3dB(A) when compared with predictions based on laboratory SRIs. Also reports measurements of the ventilation rate in bedrooms with one window partially open and all other doors and windows closed. Measurements were made using nitrous oxide as a tracer gas. Finds that natural ventilation arisingfrom dual glazing with staggered openings is not very different from single glazing opened the same distance. Typical ventilation rates were 2-3 air changes/hour.