Abstract: A dust extraction unit is disclosed including a first and a second air filter removable and mountable within the dust extraction unit and a body defining an air flow path which passes through the first and the second air filters when the first and the second air filters are mounted within the body of the dust extraction unit. The body of the dust extraction unit includes a first portion operable to receive the first air filter and a second portion operable to receive the second air filter. The first and second portions are connected by a hinge so that the first portion is moveable between a first configuration in which the first and second portion define an air flow path through the dust extraction unit and a second configuration which provides access to the portion of the dust extraction unit operable to receive the second air filter.

Abstract: A dust extraction unit is disclosed including a first and a second air filter removable and mountable within the dust extraction unit and a body defining an air flow path which passes through the first and the second air filters when the first and the second air filters are mounted within the body of the dust extraction unit. The body of the dust extraction unit comprises a first portion operable to receive the first air filter and a second portion operable to receive the second air filter. The first and second portions are connected by a hinge so that the first portion is moveable between a first configuration in which the first and second portion define an air flow path though the dust extraction unit and a second configuration which provides access to the portion of the dust extraction unit operable to receive the second air filter.

Abstract: An acoustic curtain comprising a panel of sound absorbent material within an envelope formed from polymeric sheets, with means for attaching adjacent panels to one another, and wherein the curtain comprises a magnetic element.

Abstract: There is disclosed an acoustic barrier (40) for use in a pile driving method in which a pile (I0) is driven into the ground 60, the acoustic barrier (40) comprising: an acoustic dampening layer (42); and a magnetic element (36); wherein the acoustic barrier (40) is arranged to be at least partly wrapped around an axial portion of the pile (I0) so that the acoustic dampening layer (42) at least partly surrounds the axial portion of the pile (I0), and wherein the magnetic element (36) is arranged to releasably secure the acoustic barrier (40) to the pile (I0). There is also disclosed a pile driving method comprising wrapping the acoustic barrier (40) around an axial portion of a pile (I0), driving an axial length of the pile (I0) into the ground, and removing or repositioning the acoustic barrier (40). There is also disclosed an acoustic barrier for a pile driving hammer having a support frame which can be detachable attached to the hammer.

Abstract: A flexible acoustic barrier for suspending from a support frame wherein the flexible acoustic barrier comprises a portion of acoustic insulation material and at least one loudspeaker that is configured to emit an audible sound-masking signal to mask sound from a sound source. Another aspect of the invention comprises a corresponding method of mitigating noise pollution.