Worked example: Entrance hall sound absorption

Example: Entrance hall The entrance hall has dimensions 3.0 m (width) x 4.0 m (length) x 2.5 m (height). The concrete floor is covered with carpet, the walls are painted concrete blocks and there are four timber doors (1.0 m x 2.4 m). To satisfy regulation 51, either use – (a) Method A: Cover at least 3.0 x 4.0 = 12 m2 with a Class C absorber or better; or (b) Method B: Provide a minimum of 0.2 m2 absorption area per cubic metre of the volume.