If the ventilation unit is undersized, the entire system must be replaced.
Is the CO₂ level too high in your bedroom and you sleep all winter with the window open?
Do you open the windows when guests arrive, just to make sure there’s enough air for everyone?
Would your home be quiet if only the ventilation system didn’t constantly hum?
Does the air in your office meeting room feel stuffy after just half an hour, even though you’ve opened all the vents?
It may well be that solving such a situation requires replacing the entire ventilation system — installing new ducts, silencers, and a new unit. The budget for this can be quite high, and if the ducts are built into the structure, dismantling the old system and installing a new one can be expensive — sometimes so costly that it’s not even worth doing.
But sometimes there’s a simpler solution.
If not all rooms are occupied at the same time, the problem can often be solved by redirecting airflow to the areas where people are actually present.
Ventilation diffusers equipped with air quality sensors reduce airflow in rooms where air quality is already within normal limits and increase it in areas where demand is higher.
In this way, the limited capacity of the ventilation unit is directed primarily to where it’s most needed, while less air is supplied to spaces where the demand is lower. The central unit can then operate at lower speeds, more quietly, and without wasting energy.
This approach can help avoid replacing an undersized ventilation unit—or even the entire duct system—while restoring proper ventilation at a much lower cost.