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Tuan Nguyen: Let's sit near the window, Yumi.
Tuan Nguyen: This room feels warm and the air is still.
Tuan Nguyen: Do you mind if I open the window?
Yumi Nakamura: Would more fresh air help?
Tuan Nguyen: Yes, the room has become really uncomfortable.
Yumi Nakamura: I don't mind at all; go ahead.
Tuan Nguyen: Thanks, I'll open it now.
Yumi Nakamura: The difference is marked, so let's stay here.

Fresh air can improve comfort in a crowded room. When many students sit together, the room can feel as if all the air has gone. The change after opening a window is often immediate and marked.

Short periods of wide opening replace air efficiently. You do not need to keep the window open for hours. A select few minutes of full opening can make the difference plain.

Outdoor noise may affect when windows are opened. Near a busy street, a long open window is not always possible. An inspection of the area helps the class choose a good time.

People near the window may feel colder first. This is obvious, but it can be managed. A jacket or a move to another chair solves the problem.

The class can agree regular ventilation breaks. With a little leadership, everyone can accept short breaks. A short break is not an absolute answer, but it helps most rooms.