Simply because pyramids are massive monumental structures and a tomb of the pharaohs. It is not designed to be a livable house or a structure, but a tomb designed to protect the pharaohs body forever. "Air shaft " can be considered as ventilation or openings but some theories that this has something to do with the stars, the so called "star shafts".
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What are the standard heights from the floor to the top of door and windows in residences
Doors, windows, tables, books, walls, rooms.
Examples: A pyramids, person shape like pyramids, foods shape like pyramids etc
I believe that they are three main pyramids in Giza.
The Great Pyramids of Giza. The pyramid of King Khufo. Random tombs of people. Some pyramids have more than one person.