Different ventilation systems

If you live in a house that was built before the 1970s, to some extent we can generally say that the building’s ventilation system probably has less need for maintenance than a newer property. Older properties usually require less maintenance simply because the ventilation, in many respects, takes care of itself through passive ventilation and leaks. As of the 1970s, houses were built more air tight to save energy. These houses, and especially those built after 1980, often have a system of fans and ducts that control air intake and exhaust instead. This makes it important that the systems can continue to work as was intended when they were installed. Over time, ducts and filters are slowly blocked and clogged – and so they require regular maintenance.

How often should I clean the ventilation system?

How and when the ventilation should be cleaned varies between different ventilation systems. Other aspects that affect this include the size of the system. In general, we can say that no more than three to six years should pass before the system is inspected and cleaned.

S-ventilation = passive ventilation.
F-ventilation = mechanical ventilation with exhaust air flows regulated by fan.
FT-ventilation = mechanical ventilation with both exhaust and supply air flows regulated by fan.
(FX/FTX-ventilation = ventilation with heat recovery).

Are there any official regulations on ventilation inspections?

There are no legal requirements for ventilation inspections in houses – unless the system is newly installed. On the other hand, public premises such as schools and healthcare facilities, as well as apartment buildings and office buildings, must regularly undergo a mandatory ventilation inspection (OVK). There are special requirements for how this inspection is conducted. Contact your local chimney sweeping company for more information.

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