Two images of a kitchen ceiling showing an exposed duct and surrounding insulation on the left, and a finished ceiling with the duct opening on the right.

I am going to order and install a free-hanging hood in my kitchen.
The hood weighs 35kg and will be attached with 4 screws in each corner (see image below)
Diagram of a ceiling-mounted range hood with measurements, showing four screw holes in the corners for fastening. Dimensions include 320mm, 255mm, and 221mm.

I thought I could run 2 of the screws (if I use long screws) through the beam layer.
It's possible I could get one screw in the sparse panel. But the last one I need to run through the Huntonit.
I think the sparse panel is at 30cc.

Do you think it will hold? I would prefer not to have to take down the ceiling if it can be avoided.
 
The fan is not likely to fall down, but it doesn't exactly feel like a perfect installation. There is a risk that it may affect the ceiling in the long term, where you don't have direct contact.

If the ceiling can't be taken down, maybe a board or sheet metal can be fully attached and function as a spacer?
 
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