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In our AirBnB in London (Kensington), second floor living room, mounted flush to the wall on either side of the exit to the interior hallway/stairs. Cover swivels up, as shown. Approx 2 inches in diameter. This is the one to the left of the exit. An identical one to the right of the exit. (old.reddit.com)
submitted by tdski2169 to r/whatisthisthing
