Sound-insulating construction comprises sound-absorbent material placed or incorporated in air or gas intake, has width or depth between 50 and 200 mm and length or diameter dependent upon rate of flow

摘要

The sound-insulating construction comprises sound-absorbent material placed or incorporated in an air or gas intake, has a width or depth (B) between 50 and 200 mm and a length (L) or diameter dependent upon the rate of flow. It has a number of holes (3) extending into the material (1) from one side (4) and through the entire width to the other side (5). Each hole is surrounded by the sound-absorbing material with a thickness which is at least equal to the radius of the hole.