Frequently asked questions

How to find the right filter?

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 the start page.

How can I dispose of my old filters?

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

Why should I change my filters regularly?

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.

How often do the unit filters need to be changed?

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.

Why should I only use original filters?

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.

How are the filters delivered?

The filters are delivered as a parcel to the delivery address.

What are the shipping costs?

Otherwise we charge a flat rate of 9 CHF (incl. VAT).

My delivery has not arrived, what should I do?

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

How long does the delivery take?

Usually, a delivery takes two to three working days from order.

How to log in

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

How can I register?

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

I have forgotten my access data

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.

Where can I find my invoice?

You will receive an order confirmation via email.

Is payment secure?

Yes, the data transfer of your payments and personal details is encrypted with 1024 bit and insured by our payment processor Deutsche Card Services GmbH.

I have received a defective filter

Please create a support request: Support

I have received a wrong filter

Please create a support request: Support

Which maintenance contracts does Zehnder offer for comfort ventilation?

You can find all contracts here.