To foam or not to foam?

[Lattematte]

That is the question.

Yes, what do you say: Should I foam in the gap between the wall and the ventilation pipe (in plastic)? Or will it breathe through the gap even when I put ventilation grilles on both the outside and inside?

This is about a basement.
See images.

 

[KnockOnWood]

I would definitely have injected some foam sealant.

 

[Utdelning]

I would probably have used sealant like facade sealant. And depending on the distance between the module pipe and the hole wall, I might have placed a backing rod.