| dc.description.abstract | The effect of a frame around glass fixed windows on outdoor-indoor transmission class (OITC) was studied here. Three
frame materials were selected, i.e. timber, Aluminum and unplasticized Poly Vinyl Chloride (uPVC). The use of real open
window (to differentiate it from partially open double layered window) for natural ventilation was also studied. The top hung
style was selected due to common usage and the possibility of noise blockage by the shutter. Laboratory test complies with
ASTM E-90 was employed. The study showed that weight and density, which play significant roles in sound insulation
quality of a material was not borne out for the window frame. Here, timber as the heaviest material gave lowest OITC and
transmission loss (TL) contour. This was due to the absence of sealant and rubber strips which are unusual for timber caused
by large thermal expansion coefficient. Top hung openings of 5 and 10 showed similar transmission loss contours, but the
OITC of the 5 open window was slightly higher than the 10. | en_US |
