GROHE WHISPER For peace comfort and design freedom our concealed cisterns feature GROHE Whisper technology Thanks to decoupled pipe supports there is no sound transfer to the structure of the building when the water is released from the cistern to the bowl Allowing the WC to be located in the most convenient location without fear of disturbing others DIN 4109 describes the permitted noise levels in areas requiring protection against noise from household equipment which must also be observed in the case of sanitary installations The values specified in DIN 4109 A1 or DIN 4109 Supplement 2 are the generally accepted technical regulations The renowned Fraunhofer Institute has confirmed the excellent noise control properties of the GROHE Whisper technology in Rapid SL and Uniset in its own tests The excellent measurement results of all products meet the requirements of DIN 4109 A1 VDI 4100 or DIN 4109 Supplement 2 Deviating from standard noise control with 30 dB A DIN 4109 A1 defines Increased noise control requirements with 27 dB A Comfort noise control with 24 dB A Applies to apartment buildings For semi detached and terraced houses the values are 25 22 db A RAPID SL NOISE CONTROL AT THE HIGHEST LEVEL Level 1 Standard noise protection Level 2 Increased noise protection Level 3 Comfort noise protection Under practice oriented conditions the Fraunhofer Institut für Bauphysik has carried out noise measurements with Rapid and Uniset The GROHE Rapid SL flush system has been recognised by the Quiet Mark scheme for a second year running The flush and cistern refill was tested by Quiet Mark whose key mission is to drive awareness and support the reduction of noise related issues GROHE has renewed the Quiet Mark on its Rapid SL WC flush system retaining its position as the only cistern in the industry to have the sought after mark of approval GROHE s innovative Whisper quiet water technology delivers extremely quiet acoustics According to a survey commissioned by Defra and Quiet House 76 of the UK population feels that the quality of their home life is affected by noise with this impacting on health factors such as sleep disruption Respondents confirmed they had been woken up kept awake or changed the time they went to bed or got up because of noise levels with 47 claiming it is noise from within the home that causes the disruption Rapid SL On the wall Rapid SL Studded wall DIN 4109 Level 1 DIN 4109 Level 2 DIN 4109 Level 3 grohe co uk

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