When testing the performance of the NAT Vent Attenuator at Winford Primary School, we performed a noise break in assessment whilst opening a window. The video above illustrates the sound level difference has a steep decay from a small opening.
An important area of research for MACH Acoustics, below are a few examples of a FDTD model we have produced to demonstrate various open window conditions.
First a top swung window, notice the noise ingress into the room.
The above but as a bottom swing.
An open window representation.
The above but with a internal baffle.
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