Building code requires my kitchen to have a 15cmx15cm vent (besides the kitchen cook-top vent). This vent is basically a hole in the wall that reaches to the outside. The vent has grating on both sides.
It is very cold in the winter and cold air seeps right into the kitchen, very possibly undermining the ground floor's heating. Can this hole-in-the-wall be insulated somehow ?
The vent cover looks like this: