Mapguy

Xiaomi Mi Air Purifier Pro models work well and BETTER with Filtrete added to your air conditioners. As suggested before, overestimate your room size.

I have been told directly by the chief officer (often in charge at the Information Desk) that the Chiang Mai Office requires 21, NOT just "at least" 15 days as written on the sheet of instructions handed out by the Information Desk. I suggest 21 days is a good idea.