MVHR ducts through eggar floor deck?

[junglejim]

Hi, I’ve got my MVHR designs but wondering about coming up through the floors deck (above posi joists). I have one section where all of my upstairs ducts will come through as o 7 ducts each with 75mm diameter. I’m wondering whether I should cut a rectangular section and add noggins around the edges of deck or individual circular holes or something else? Thanks

Edited 5 hours ago by junglejim

[crispy_wafer]

As my MVHR unit is loft based, I constructed a small floor to ceiling cupboard in my sons room for shoes and the like.  At the back of this is a 300mm*500mm void which I pass a bunch of ducts and an SVP stuffed with sound insulation as best i could.  All through egger ontop of posi's.  Personally I wouldn't cut each hole individually.

 

Edit,  All this is within the heated envelope of the house.

Edited 4 hours ago by crispy_wafer