2 rooms in my house hav weird ventalation grate things in 2 of the bedrooms.
Is there any reasons for this? Can I block them up with cardboard to stop cool damn air coming in my room?
or are these vital for some house air flow thing?
Is there any reasons for this? Can I block them up with cardboard to stop cool damn air coming in my room?
or are these vital for some house air flow thing?