The ventilation system keeps the indoor air in your apartment fresh.

Maintenance ensures good indoor air

Heka’s buildings are equipped with either gravity or mechanical ventilation. The latter requires slightly more maintenance. Here is how you can maintain the ventilation’s functionality and enjoy fresh indoor air:

  • Always keep the supply air vents or ventilation holes in window frames or walls open. Do not close them fully even when it is freezing outside. If the air vents are blocked, the system may even suck in replacement air to the apartment from the drains.
  • Do not change the position of the exhaust air vent. Doing so may cause issues in the operation of the ventilation in other apartments in the building.
  • Clean the supply air vents and ventilation holes of dust by vacuuming them with a soft nozzle or by brushing them at least twice a year.
  • Dust and grease accumulate inside the exhaust air vents. Clean the vents with warm water, washing agent and a brush at least twice a year. You can open a vent by turning the round frame anticlockwise. Dry the vents before reinstalling them.
  • Do a quick check on the ventilation: Place an A4 paper sheet on top of the exhaust air vent. If it gets sucked against the vent, air is flowing in the correct direction through the exhaust air vent.


In buildings that have apartment-specific air conditioning, the filters are replaced by maintenance two to four times per year, as needed.

Malfunctions in the ventilation

Do you suspect that your apartment’s ventilation is not working as it is supposed to? Characteristics of a malfunction in the ventilation system include:

  • Odours and smoky smells do not disappear from the apartment in a reasonable amount of time.
  • It smells strongly like a sewer in your apartment.
  • The inner surfaces of the windows fog up or freeze despite the windows being closed properly.
  • The bathroom is slow to dry after use of the shower even when the floor and walls have been dried with a squeegee after use and the door has been left ajar.
  • Odours from the stairwell get inside the apartment despite the doors being properly closed.
  • Air whistles through gaps in the door or the mail slot.
  • The exhaust air vents whistle in a disruptive manner.
  • The indoor air is stale again soon after airing the room.

If the descriptions above sound familiar, first check that all the supply and exhaust air vents in your apartment are clean. If the vents are clean and the situation remains unchanged, submit a defect notification.