Make a hole for a vent in a load-bearing wall?

[mariaria]

I want to install supply air vents above my windows. According to the house blueprint, there is a "hammarband" in the wall, which I believe is really thick timber. Can one drill approximately 8cm round holes with a hole saw in this? I'm thinking about the load-bearing capacity.

 

[snickar_lasse]

hello! do you have to drill just above the window? I usually mount them on the side of the window.

 

[mariaria]

The manufacturer recommends above windows but you can probably place it beside them as you say. Above windows, I have a plywood board, the rest of the house (i.e., if you were to mount them beside the window) has mexitegel. Drilling into mexi seems equally troublesome...

 

[jakim]

It may very well be that the load-bearing beam is a bit above the window so that if you drill quite directly above the window, you miss the "hammar bandet."

The hammarbandet in my house is a laminated beam that is about 50x300mm, i.e., 50mm thick and 300mm high.

 

[mariaria]

But I don't dare to take the chance that the hammarbandet is positioned higher. I have tested with a stud finder and above the window section (which is 4 m) it signals every 60th cm, which supports Jakim's theory that the hammarbandet isn't directly above the windows but higher up? Does anyone know how a stud finder responds when tested directly on the hammarbandet?