Zehnder ComfoAir 350/450/550 Filters 500×197×16.5 mm – Original G4 + G4 / F7 + G4 Sets

Original Zehnder ComfoAir 350/450/550 Filter Sets

Zehnder ComfoAir 350/450/550 filters with dimensions 500×197×16.5 mm, designed for supply and exhaust air filtration in compatible Zehnder ventilation units.

Two original Zehnder filter combinations are available: a G4 + G4 System Protection Filter Set and an F7 + G4 Hygiene Filter Set. Both options help protect the ventilation unit, while the F7 version provides finer filtration of incoming outdoor air.

You can also view our full range of recuperator filters.

Available Filter Set Options

G4 + G4 System Protection Filter Set – 400100085

The G4 + G4 set contains two coarse filters designed primarily to protect the ventilation unit and heat exchanger from larger airborne contaminants.

• 2 × G4 / ISO Coarse 60% filters
• Filter dimensions: 500×197×16.5 mm
• Original Zehnder code: 400100085
• Suitable for standard system protection
• Captures dust, fibres, insects and other coarse particles

F7 + G4 Hygiene Filter Set – 400100084

The F7 + G4 set combines finer filtration of incoming outdoor air with protection of the exhaust air side of the ventilation unit.

• 1 × F7 / ePM1 50% supply air filter
• 1 × G4 / ISO Coarse 60% exhaust air filter
• Filter dimensions: 500×197×16.5 mm
• Original Zehnder code: 400100084
• Suitable for areas with pollen, fine dust or increased outdoor air pollution

G4 + G4 or F7 + G4 – Which Set Should You Choose?

The G4 + G4 set is the standard choice when the main priority is protecting the ventilation unit from larger particles and dust.

The F7 + G4 set is the better choice when finer filtration of supply air is required. The F7 filter captures smaller airborne particles than a G4 filter and is particularly useful during pollen season or in areas with increased traffic and outdoor air pollution.

What Is the Difference Between G4 and F7 Filters?

G4 / ISO Coarse 60% Filter

The G4 filter is designed to capture larger airborne particles such as dust, fibres, insects, coarse pollen and other debris. It helps protect the heat exchanger and internal components of the ventilation unit from contamination.

F7 / ePM1 50% Filter

The F7 filter provides finer filtration of incoming outdoor air. It helps reduce fine dust, pollen, soot and other smaller airborne particles entering the building through the ventilation system.

It is particularly useful for homes located in urban areas, near busy roads or in locations with elevated pollen levels.

Compatible Models

• Zehnder ComfoAir 350
• Zehnder ComfoAir 450
• Zehnder ComfoAir 550

Important: These filters are not compatible with Zehnder ComfoAir Q350, Q450 or Q600 ventilation units. The ComfoAir Q series uses different filter dimensions and specifications.

Original Zehnder Filter Codes

• 400100085 – G4 + G4 System Protection Filter Set
• 400100084 – F7 + G4 Hygiene Filter Set
• 400100066 – alternative reference
• 006040220 – alternative reference
• 006040230 – alternative reference

Checking the filter dimensions and original reference number is recommended before ordering.

Technical Specifications

• Brand: Zehnder
• Compatible models: ComfoAir 350 / ComfoAir 450 / ComfoAir 550
• Filter dimensions: 500×197×16.5 mm
• Available filter sets: G4 + G4 or F7 + G4
• Original codes: 400100085 / 400100084
• Alternative codes: 400100066 / 006040220 / 006040230
• EN 779 classification: G4 / F7
• ISO 16890 classification: ISO Coarse 60% / ePM1 50%
• Number of filters per set: 2
• Filter construction: pleated, framed
• Original Zehnder product
• Made in the EU

Filter Standards

• ISO 16890
• EN 779:2012

Pleated Filter Construction

The filters use pleated filter media to provide a large filtration surface within a compact frame. This construction distributes airflow across a greater area of filter material while efficiently collecting airborne contaminants.

• Large filtration surface
• Efficient particle collection
• Stable airflow through the filter media
• Rigid framed construction
• Precise fit in compatible Zehnder units

When Should Zehnder ComfoAir Filters Be Changed?

Ventilation filters should be inspected regularly and replaced when visibly contaminated or when the ventilation unit indicates that filter replacement is required.

A typical replacement interval is approximately 3–6 months, depending on operating and environmental conditions such as:

• Outdoor air pollution
• Pollen levels
• Nearby construction work
• Traffic pollution
• Indoor dust levels
• Pets
• Ventilation system operating time

Regular replacement of heat recovery unit filters helps maintain proper airflow and protects the ventilation system from excessive dust accumulation.

Why Choose Original Zehnder ComfoAir Filters?

Original Zehnder filters are manufactured for the specified dimensions and filtration requirements of compatible ComfoAir ventilation units. A correct fit helps minimise air bypass around the filter and ensures that air passes through the intended filter media.

Choosing between G4 + G4 and F7 + G4 allows you to select either standard system protection or finer supply-air filtration depending on your requirements.

FAQ – Zehnder ComfoAir 350/450/550 Filters

Do these filters fit Zehnder ComfoAir 350?

Yes. These original Zehnder filter sets are suitable for Zehnder ComfoAir 350 units using 500×197×16.5 mm filters.

Do these filters fit Zehnder ComfoAir 450?

Yes. The filter sets are compatible with Zehnder ComfoAir 450 units using the same filter dimensions.

Do these filters fit Zehnder ComfoAir 550?

Yes. They are also suitable for Zehnder ComfoAir 550 ventilation units using 500×197×16.5 mm filters.

Are these original Zehnder filters?

Yes. These are original Zehnder filter sets with reference numbers 400100085 and 400100084.

Which set should I choose – G4 + G4 or F7 + G4?

Choose G4 + G4 for standard ventilation-unit protection. Choose F7 + G4 when you want finer filtration of incoming outdoor air, particularly in areas with pollen, fine dust or higher outdoor air pollution.

Are these filters suitable for Zehnder ComfoAir Q350, Q450 or Q600?

No. The ComfoAir Q350, Q450 and Q600 series uses different filters. These filter sets are intended for compatible ComfoAir 350, 450 and 550 units.

What are the filter dimensions?

Each filter measures 500×197×16.5 mm.

How often should the filters be replaced?

A typical replacement interval is approximately every 3–6 months, depending on air quality, system usage and environmental conditions.

Bulk Orders

Discounts are available for larger orders of 10 filter sets or more. Contact us for an individual quotation for commercial or larger-volume orders.