I have used Biltema's self-adhesive soundproofing mats to silence fan noise from computers. They work well there, so it might be an alternative to place on the inside of the boards and then possibly a layer of insulation around the pipe.
 
Hello,

What is meant by plåthörn and plåtvinkel?
How do you mean they should be mounted then?
 
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Vi vill skicka notiser för ämnen du bevakar och händelser som berör dig.