Anyone know what's this box in the corner of the room? Located upstairs front room, facing the road.
The 'tube' in wall leads straight outside, and it looks like the rest is some sort of gross filter? Behind the bottom half of the box is just plaster with a bit of paper stuck there :/
The 'door' is about 10cm deep (off the wall), and has has small side grill/vent on the hinge-edge.
Looking at streetview, other houses have similar 'vent' on the outside too. I assume it's some sort of filtered-air brick-esque device? Hoping to be able to remove it, or at least replace with something considerably slimmer...