Zehnder ComfoAir Standard 300 / 375 filter set G4+G4 (original)
Zehnder ComfoAir Standard 300 / 375 filter set G4+G4 (original)
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
General dust and particle filtration
Key features of this product
Certified quality to international ISO standards
Manufactured entirely within the European Union
Effective filtration for up to 6 months.
Price for set
Model compatibility
Original Zehnder filter set for the following ventilation units:
- Zehnder ComfoAir Standard 300
- Zehnder ComfoAir Standard 375
Suitable for the Basic/Basis and Luxe versions in the ComfoAir Standard 300/375 filter family.
This is the older ComfoAir/ComfoD/WHR cassette-filter family, not the ComfoAir Q series. Check the unit name and installed filter reference when selecting replacements.
What the filter set protects against
The set contains two G4 filters, rated ISO Coarse 60%: one for extract air and one for supply air. They capture coarse dust, lint and larger airborne particles and help protect the ventilation unit from dirt accumulation. G4 filters provide basic filtration; for improved fine-particle and pollen filtration, choose the compatible G4+F7 set.
Use and maintenance
The set contains two filters. Install the G4 extract filter on the extract-air side and the G4 supply filter on the outdoor-air intake side, following the unit instructions. Inspect filters regularly and replace them approximately every 3-6 months, or sooner when dirty, clogged or indicated by the unit. Replacement frequency depends on outdoor pollution, dust and operating conditions. Switch off the unit before replacement, fit both filters securely and reset the filter reminder according to the unit manual. Replace used filters rather than washing them.
Manufacturing quality
These are original Zehnder filters, supplied directly by Zehnder. Pleated media increase the available filtration surface. Plastic frames and sealing edges support a secure fit in the compatible cassette-filter holders. The documented ISO 16890 classifications are ISO Coarse 60% for both G4 filters.
Original product codes
- Current two-filter set MPN: 400100085.
- GTIN/EAN for the two-filter set: 8717573486071.
- Verified legacy G4+G4 set reference: 006040202.
| Filter Type / EN 779 Class | ISO 16890 Class | Efficiency (%): Coarse (>10 µm) | PM10 (≤10 µm) | PM2.5 (≤2.5 µm) | PM1 (≤1 µm) | Gas/VOC Removal | Real-Life Particle & Pollutant Examples |
|---|---|---|---|---|---|---|---|
| G1 | ISO Coarse | ~40% | <10% | ~0% | ~0% | Sand, textile fibers, carpet fluff, plant debris, insect wings, visible lint | |
| G2 | ISO Coarse | ~50% | <15% | ~0% | ~0% | Sawdust, hair, coarse textile particles, large flakes of paint or rust | |
| G3 | ISO Coarse | ~60% | <25% | ~5% | ~0% | Coarse dust, lint, animal hair, some pollen | |
| G4 | ISO Coarse | 65-75% | 25-35% | 10-15% | <5% | Large pollen grains, soil particles, textile lint | |
| M5 | ISO ePM10 ≥50% | ~80% | 50–65% | 20–30% | 10–15% | Pollen, mold spores, pet dander, house dust | |
| M6 | ISO ePM10 (60–80%) | ~90% | 65–80% | 30–45% | 15–25% | Building/construction dust, concrete dust, ash particles, fine cement dust | |
| F7 | ISO ePM2.5 (50–65%) | >90% | 75–90% | 50–65% | 30–45% | Bacteria, smog, tobacco smoke particles, combustion dust, spores, wildfire smoke particles | |
| F8 | ISO ePM2.5 (65–80%) | >95% | 85–95% | 65–80% | 45–60% | Fungal spores, air pollution aerosols | |
| F9 | ISO ePM1 (80–95%) | >95% | >95% | >90% | 80-95% | Diesel soot, airborne viruses, smoke from traffic and industry, combustion particles, ultra-fine dust, secondary organic aerosols from chemical reactions in air | |
| Activated Carbon | Not classified (gas filter) | Varies (combined with prefilter) | Varies | Varies | Varies |
High Efficiency |
Volatile Organic Compounds (VOCs), formaldehyde, ozone, nitrogen dioxide (NO₂), sulfur dioxide (SO₂), benzene, toluene, cooking odors, cigarette smoke odors, pet smells, perfumes |
Order Processing Time
All in-stock products are dispatched within 24-48 hours, except those clearly marked with extended dispatch times (5-15 business days).
Shipping Costs
Shipping is free for all orders over €150. For orders under €150, shipping costs will be calculated at checkout.
Estimated Delivery Times by Region
Albania, Montenegro, Bosnia and Herzegovina, Moldova, North Macedonia
Carrier: Poczta Polska Registered
Estimated delivery: 5–10 business days
Iceland, Norway, Serbia, Switzerland, Cyprus, Croatia, Malta
Carrier: PostNL Tracked
Estimated delivery: 5–10 business days
United Kingdom
Royal Mail: 4–6 business days
Parcel Force: 4–6 business days
Canada, Australia, New Zealand
UPS Expedited: 3–6 business days
Poczta Polska Registered: 5–15 business days
United States (US)
Carrier: PostNL Tracked
Estimated delivery: 5–10 business days
Austria, Slovakia, Czech Republic, Hungary
UPS Courier: 3–4 business days
DPD Courier: 3–4 business days
GLS Courier: 3–4 business days
Belgium, Bulgaria, Denmark, Spain, France, Greece, Ireland, Italy, Luxembourg, Netherlands, Portugal, Romania, Sweden, Slovenia
UPS Courier: 4–5 business days
DPD Courier: 4–5 business days
GLS Courier: 4–5 business days
Germany
DHL Courier: 2–3 business days
DPD Courier: 2–3 business days
GLS Courier: 2–3 business days
Estonia, Latvia
Omniva Terminals: 1–3 business days
DPD Courier: 1–3 business days
Finland
Posti Courier: 2–4 business days
Lithuania
Omniva Terminals: 1–2 business days
DPD Terminals: 1–2 business days
DPD Courier: 1–2 business days
Poland
InPost: 2–3 business days
DPD Courier: 2–3 business days
GLS Courier: 2–3 business days
Order Tracking
Once your order is on its way, we’ll send you the confirmation email with tracking details so you can easily follow its journey to you.
Customs and Duties
Please note that any customs fees, taxes, or import duties are the responsibility of the recipient and can vary depending on your country’s regulations.
Business Days
Delivery times are calculated based on business days, which are Monday to Friday, excluding public holidays.
Easy returns within 30 days
You may return any product within 30 days of receiving it for a full refund – no questions asked!
If you need to return items after 30 days, please contact us. We review these requests on a case-by-case basis and will do our best to help.
Condition of returned products
We accept returns of products unused in intact condition, including those unpacked but not damaged. Products that are damaged, dirty, or otherwise unusable cannot be accepted for return.
Defective or incorrect items
If you receive a defective or incorrect product, please contact us immediately. We will ensure the issue is resolved promptly, as your satisfaction is our top priority.
Refund processing timeline
Once your returned product is delivered to us, we will verify its condition within 5 business days. Refunds will be processed within an additional 5 business days after approval, using the original payment method.
Returning the order
Please contact us before sending back any products. We will provide you with the return shipping details and assist you throughout the process. We cover all costs of return shipping.
Cancelling the order
Cancellations are possible before your order has been shipped. Refunds of cancelled orders are processed within 5 business days.
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