A ventilation system must be not only installed but accessible for maintenance. Before choosing the heat recovery unit's location, check whether service doors can be opened, filters removed and the manufacturer's inspection points reached.
Filter maintenance depends on the specific unit and surroundings. Do not prescribe the same mandatory replacement interval for all manufacturers. Use filters of the appropriate purpose and dimensions rather than deciding solely because a part fits the casing. Zehnder's maintenance information considers filters alongside other system checks. S29
After repairs or changes in room use, airflow is worth checking too. If a system becomes noisy or air exchange worsens, merely increasing fan speed may not be enough. Filters, grilles, duct resistance and system adjustment need assessing. S30
The user should receive clear information: unit model, filter type, manual and who can carry out maintenance. Internal work specified by the manufacturer should not be improvised using a video for another model.
Before ordering: ask how much service space will be needed and which consumable components will be used. Convenient maintenance starts with choosing the right installation location.
Information sources
Choose a source to read its summary without leaving this page.
- S29
- S30
Sources checked on 2026-09-29. If the manufacturer has changed the product or documentation, follow the latest technical information for the specific model.