DIN 18017-3
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Title
Ventilation of bathrooms and toilet rooms without outside windows - Part 3: Ventilation by fans
Short description
The standard DIN 18017-3 applies to ventilation systems with fans for ventilating bathrooms and toilet rooms without exterior windows in apartments and similar occupancy areas, such as hotel units. The standard assumes that an outdoor air flow corresponding to the exhaust air flow can flow through leaks in the building envelope and, if necessary, through exterior component air vents, from the outdoors through the living and occupancy areas or directly into the exhaust rooms via a supply air duct.
Link
https://www.beuth.de/de/norm/din-18017-3/351891559