Seal holes through the exterior wall

[benox]

Hello!

I've just removed an old air-to-air heat pump. Now I have a hole through the wall that I need to seal in some way. For the time being, I've put a towel on the inside and a piece of brick loosely in the hole on the outside.

How do I seal it permanently in the best way?

 

[cubix]

What type of wall is it?

 

[benox]

From the inside out, it is:
Some semi-porous wood fiberboard, plastic sheeting, rough-sawn plank, insulation, asfaboard, air gap, brick

 

[PCLarsson]

Foam sealant.

 

[MagnusSt]

If you don't have any bricks lying around, an alternative could be to put a vent on the wall, either functional or fake.

http://www.jula.se/ventilgaller-074141

Something like that on the outside maybe?