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The following diagram illustrates the advantage of living space ventilation as compared with window ventilation only in a bedroom occupied by 2 persons.
After 6.5 hours, the limit established by the Federal Ministry of Health is already exceeded by more than 60%. After as little as 1.5 hours, the maximum limit of 1,500 ppm is exceeded and, after a total of 8 hours, the CO2 value is about 2,450 ppm. Such a high level of hazardous substances is unhealthy. This requires a quick change of this situation by installing a living space ventilation unit or at least a single-room unit. You owe this to your own health.
A mechanical ventilation and deaeration unit always allows you to meet the 1,000 ppm limit established by Pettenkofer. This makes itself felt in a restful sleep and higher performance.

For a better representation, please click on the diagramme.