MVHR ducting insulation?

[Street18]

Hello, complete novice here. Please help

 

Thank you in advance.

 

Having a few issues with our MVHR system (in the loft) shutting down due to cold temperatures. It's meant to shut down at certain temperatures. To stop it shutting down I need to properly insulate all the ducting you see in these photos. I would really appreciate some help please advising what type of insulation I need for the following:

1. What type of insulation is needed for the larger ducting for the fresh air support and air extraction (190mm diameter)?
2. What type of insulation is needed for the smaller 90mm diameter ducting exposed in the loft that is supplying and extracting from the rooms?
3. What type of insulation is needed for the unit itself?
4. What type of insulation is needed for the manifold where all the ducting goes into on the wall as you can see?

[JohnMo]

I would get some 25mm PIR insulation. One sheet should be enough. Also get some aluminium tape and mineral wool or B&Q do some white plastic wool insulation.

 

So make a box out of PIR to insulate the manifold and pipes below, cut to shape and tape together. Fill with wool insulation, make a spacer to wedge the whole thing against the wall from the MVHR unit.

 

The metal pipes also need insulation, you do similar to above.