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Akatherm dBlue drainage system

Designed for noise reduction.
The Akatherm dBlue system is made from a state-of-the-art combina- tion of plastic and sound absorbing mineral filler (PP-MD). The material formula is developed by the Aliaxis R&D laboratory and offers a unique combination of acoustic performance, weight, resistance and mechanical strength. The triple-layer pipe structure is produced using latest co-extrusion technology. Each layer has its own function optimised to reduce sound levels, increase mechanical characteristics and improve the drainage flow.

specification manual - for under slab soil & waste systems 

Noise level prevention in pipe systems
The main cause of noise in indoor drainage systems (primarily focused on the downpipe) are the choice of the pipe system, the bracket type and the design of drainage system. Optimising these factors will therefore have the best influence on noise reduction. The right choice for optimal air borne noise reduction is Akatherm dBlue. The system consists of a three-layer design in which diffe- rent material media prevent noise propagation. Mineral filled PP causes good absorption of sound waves and partial inward reflection which significantly reduces transmission to the surroundings thereby limiting air borne noise. The rubber ring inter connection of the pipe and fittings absorb and limit noise transmission throughout the system.
The bracket type and distribution plays a great role in contact noise reduction by acoustically uncoupling the mechanical contact. The plastic pipe clamp of Akatherm dBlue has 3 acoustic inlays which suppresses vibrations between the pipe system and the actual bracket. The specially designed contact surface of the inlay further contributes to noise reduction. The bracket contact with the wall is a plastic fixing element which is a limited noise bridge. To reduce any residual contact noise the bracketing system should preferably be installed on the heaviest wall which further absorbs the noise.
Acceptable noise in our everyday surroundings
The acceptable noise level that a human being can be exposed to while performing everyday activities and relaxing is described as "the threshold noise level value". The diagram below shows the value of 19 dB in relation to the acceptable sound level in rooms designed for everyday stay.