The mysteries of Soviet architecture, what is it and why?

These are the kind of concrete canopies found on one of the hospitals in Moscow.

It turns out that these are lamellar canopies, which are installed to improve ventilation in the room.

The principle of operation is this:

The warm air in any room is upstairs under the ceiling and wants to be even higher, while the cold air at the bottom is flown in.

When you open the window, the warm air at the top starts to come out of the window to the street, creating a draft that sucks in the colder air from the street. That’s with a simple window.

If you put a “wing” like an airplane on the “outlet” of the warm air from the window, the warm air at the outlet of the room will first descend lower on the wing profile, creating lift like an airplane wing, and will rush up even faster on its way out of the edge, accelerating.

Thereby creating even more thrust to the cold air at the bottom of the window, which will be sucked into the room faster.

Zero cost for a fan to accelerate the ventilation of the room, the forces of nature are simply amplified by cunning.