There is a square board on the ceiling of the hotel room. Is it possible to enter?

There is a square board on the ceiling of the hotel room, so you can't get in. According to the public information of relevant platforms, the traditional tuyere (400 mm by 400 mm) cannot accommodate one person. This kind of pipe mainly provides fresh outdoor air for hotel guests, and the size of this pipe depends on the number of people in the room. According to ASHRE standard, each person needs 8 liters of fresh air per second. Even if two people live in one room according to the calculation of per person per second 16 liter, the size of this fresh air duct is about 320 mm times 200 mm, which is obviously impossible to climb.