The words you wrote are in Swedish, and their English translations are:

• [sotning](javascript:void(0)) means "chimney sweeping" or "soot removal"
• [hur](javascript:void(0)) means "how"
• [ofta](javascript:void(0)) means "often"

So your query "sotning hur ofta" translates to "how often chimney sweeping" or more naturally "how often should chimney sweeping be done" in English. Regarding how often chimney sweeping (sotning) should be done, the frequency depends on the type of heating appliance and fuel used. For wood-burning fireplaces or stoves used regularly, sweeping is typically required once a year. For heating boilers or furnaces using solid fuels like wood pellets, it can be 1 to 2 times per year. In less frequent use cases, the interval may be every 3 years. Authorities regulate exact intervals and offer allowances based on use and risk factors. You usually get notified by the appointed chimney sweep company when it is time for your scheduled cleaning and inspection.

Hence, chimney sweeping frequency depends on factors such as fuel type, appliance, and usage level. A yearly sweeping is common for regular wood burning, with longer intervals for occasional or light use.