FAQ | Zehnder Shop

To be carried out every 24 months by the specialist tradesman:

Visual inspection of the system for damage and corrosion
Check unit filter and replace if necessary
Clean room air filters and valves and replace filters if necessary
Check the outer wall grill for dirt and clean if necessary
Remove and clean heat / enthalpy exchanger
Check fans and clean if necessary
Check condensate tray and clean if necessary
Check dry siphon for function and tightness
Check air volume flows and readjust if necessary
Testing the electrical system

To be carried out every 3 months by the user:

Check the unit filter for dirt and replace if necessary
Check room air filter and replace if necessary
Clean valves and replace filters if necessary
Check the outer wall grille fro dirt and clean if necessary

You have two possibilities to find the right filter: One possibility is to select the unit in our catalogue. The matching filters are stored. The second option is to use an item number to find the right filter or filter set. Enter the item number in the item number search field on right top side.

You can dispose of the filters in the residual waste bin.

As the owner of a Zehnder ventilation system, you must have maintenance work carried out regularly, otherwise there is a risk that the system will no longer function properly and consequently the indoor climate will deteriorate in quality. The permanent supply of fresh air through a comfort ventilation system promotes well-being, sleep, concentration and performance. The extremely unhealthy formation of mould due to excessive humidity is reliably prevented. Thanks to an optional fine filter against pollen, allergy sufferers can also breathe a sigh of relief. And an optional heat exchanger with moisture recovery prevents the air from becoming too dry in winter.

The filters must be inspected every 16 weeks and replaced every 6 months according to Zehnder's recommendation. Cleaning only removes coarse dirt such as pollen, leaves, etc.. Finer particles in the filter are not removed by this. Since the filters have different permeable layers, vacuuming and blowing out only loosens the dirt particles in the deeper filter layers. This does not remove them. A regular filter change according to the recommendation is absolutely necessary.

When replacing dirty filters in a Zehnder ventilation system, you should only use original replacement filters from the manufacturer. Only original filters guarantee optimum performance, the best possible energy efficiency and hygienic and silent operation. Since you, as the owner of a Zehnder ventilation system, rightly expect healthy, fresh and clean room air at all times, you should not compromise on the subject of "filters" either.

DHL delivers the parcels to the specified delivery address. The flat-rate shipping cost is 124.00 CZK (incl. VAT) per parcel. Free shipping is offered for orders over 2480.00 CZK (incl. VAT).

If you have not received your delivery after more than 10 working days, please use the contact link at the bottom of this page to contact us. Please use the Online order number starting with ONL-* or the order number starting with 100* as reference for your inquiry.

The delivery time is displayed directly on the respective product page. Please refer to the delivery time shown there, as it may vary depending on the product.

Please click on "log-in" at the top of the screen and enter your email-address and password.

Please click on "Login" at the top of the screen, choose "Sign-up now" and follow the instructions.

If you have forgotten your password, click on login at the top of the page and choose "Forgot Password". You can enter your email that you entered during registration and request a new password.

You will receive the invoice in digital form. We will send it to the email address you provided once the goods have been dispatched.

Please contact us directly via the contact link at the bottom of this page. Our customer support team will take care of it.

To exercise your right of withdrawal, you must inform us of your decision to withdraw from this contract. You may use the model withdrawal form enclosed with the goods for this purpose. Please contact us directly via the contact link at the bottom of this page. Our customer support team will take care of it.

With the filter subscription, you will automatically receive the appropriate filters for your Zehnder ventilation system at a freely chosen interval. When placing your next order, simply select the suitable device, extract air, and supply air filters as a subscription and complete the purchase. You can cancel the subscription function up to 24 hours before the next scheduled order. Further information can be found our general terms and conditions. Find the link on the bottom of the page.

Subscriptions are only available for registered users. Please create a customer account or log in. When selecting an item in the Zehnder Shop, you can choose whether you want to order the filter once or subscribe to it. In the shopping cart, you can later select the delivery interval for the items. The same delivery interval applies to all selected items. The subscription is activated when you submit the order. You will automatically receive the same items at the selected interval. More information can be found in our terms and conditions linked in the footer.

You will receive a reminder email 7 days before the new filter packs are dispatched. You can cancel your subscription in your customer account up to 24 hours before dispatch.

You can cancel the subscription automatically in your customer account up to 24 hours before the next scheduled order. You can view and manage your active subscriptions in your customer account. Simply click the “Cancel” button. The subscription will be terminated automatically, and no further orders will be generated. Alternatively, you can cancel the subscription using our cancellation form. You will find the link at the bottom of this page. Please note that processing may take up to 30 days.

Frequently asked questions