Strengthening wall to hang MVHR unit

[Chanmenie]

I’d like to put my MVHR unit on the wall in the utility room above the washing machine and tumble drier. I’m planning on getting the Zehnder q350, having read the instructions it was says for the wall bracket the wall needs to have a density on 200kg/m2, but I have built the wall with aircrete blocks. The unit weighs 50kg 
A couple of ideas are 

1) directly above the wall is a double truss and the unit would go close to the wall (ICF) so I could bolt some metal straps to the truss joist and support the weight of the unit from the straps. But would there be a potential for sound or vibration transmission through the joist.

 

2) Use structural 18mm ply instead of plasterboard and affix the ply to the double truss and wall so the weight of the unit is spread from truss to wall.

 

Any other suggestions ? 

[JohnMo]

My unit although on a stud wall, I lined the wall in 2x layers of 18mm ply, which seemed to work well.

[Conor]

Mine is fitted to airated wall as well. Three 70mm concrete screws through the PB and into the block. No issues.

[George]

It's probably more to do with the fixings rather than the weight.

 

Lining the wall and using aircrete fixings should be fine. 

[Chanmenie]

2 hours ago, George said:

It's probably more to do with the fixings rather than the weight.

 

Lining the wall and using aircrete fixings should be fine. 

The corefix and rigifix fixings look pretty substantial and are rated well over what I need  

[George]

Yeah but fixing to aircrete is like trying to fix into a loaf of bread. 

[JohnMo]

3 minutes ago, George said:

Yeah but fixing to aircrete is like trying to fix into a loaf of bread. 

 

Use DeWalt aircrete fixing, easy cheap and fix really well.