Why did Khrushchev in the ventilation in the floor?

Everyone who has ever lived or lives in Khrushchev, seen in a corner square hatch with small holes. Many do not even know what it is and what is intended. So it is normal ventilation, which was intended for a more intensive ventilation in the apartment.

Usually people in ignorance just close up the hatch, without attaching any special significance and as a result the air exchange in residential the room is deteriorating and this factor can lead to tragic consequences, especially if the apartment has an old geyser.

Improving the air is not the main purpose. As we know in the Khrushchev laid floors made of wood and it eventually amenable to rapid decay due to the accumulation of stagnant air and moisture. As a result, the floors will eventually become unsuitable for use, and from them came the sharp smell of dampness with the release of the rust fungus.

It was therefore decided to make each apartment indoor ventilation unit. Thanks to him, the air that penetrates into the apartment of the windows and doors and got under the floor, driving out all the moisture and outdated air congestion.

That's why the usual wooden floors in the Khrushchev is still in excellent condition and will last for many years with proper natural operation. Everything - the same in those years the house was built to last.