We're in now with 7 months. I've never been chuffed at the noise of the MVHR at night in the bedrooms. We had a flexible acoustic silencer from BPC but it's been of limited value so I decided to rig my own scrappy attempt.    Firstly it's in an awkward corner so I had to go for an irregular shape.    MDF and airtight tape was the order of the day.          Some discarded foam formed the maze for the air to transit through the first level. All he