Combined heat and power units

Combined heat and power units should be innately decoupled well from the floor so that the vibrations do not spread through the floor (structure-borne sound). The manufacturer usually pays attention to this during the installation. The airborne sound emitted from the combined heat and power units must then be absorbed.


For an attenuation of the noise, you must enclose the combined heat and power units, thus build a type of room around the combined heat and power units and line this with a 5 cm thick foam - if the area is dry, our acoustic foam planes or our rebond foams are most suitable. The thicker, the better the insulation.

To maximise the insulation, you can also build a triple construct - first, a plane acoustic foam sheet is adhered, then our double-sided adhesive bituminous foil and on that another plane acoustic foam sheet. You will find more detailed information on how this construction works in our “Basics” area under “outward noise insulation”.

If the combined heat and power unit is outdoors or in an area which is damp or wet, then foams are unsuitable because they absorb water and disintegrate. You should also enclose combined heat and power units outdoors and then proceed as described above. The thicker you choose the foam, the better the insulation is in turn.
However, most combined heat and power units have to be ventilated also. Naturally, this cannot be combined directly with noise insulation. Thus you have to build a type of ventilation duct too and line this also with foams so that air can be extracted or discharged. Ideally, you should interlace the duct so that the sound cannot be emitted directly.

Rebond foam is the best foam for this purpose because it is very heavy and thus insulates noise very well. Ester sound insulation would also be well suited - this would not be quite as heavy and not quite as good as the rebond foam, but would be somewhat cheaper.

Other interesting information 

           Frequently Asked Questions   Fire protection    Optimising room acoustics

Frequently asked questions
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Resonance reduction
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         Outward noise insulation How to mount foam    Cutting Service
Outward noise insulation

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