FLEXIT L4X/S4X (VG400) F7+G4+G3 Filter set (Efficient)

Flexit filters L4X S4X VG400 257x220x48 12318

FLEXIT L4X/S4X (VG400) F7+G4+G3 Filter set (Efficient)

16.69 €

Ex VAT: 16.69 €

Reference: FLEXITC2-1 In stock

Filter dimensions	257x220x20 257x220x48
Class EN779	F7+G4+G3
Class ISO16890	ePM1 70%
Protection level	High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust.
Quantity of filters	3

Advantages

German filtration material – hygienic (VDI 6022) and PFAS-free, for cleaner and safer air

ISO 16890 tested – performance verified by an accredited laboratory in Germany

Made in the EU – reliable quality and strict safety standards

Maximum protection – ePM1 70% removes up to 40% more smog, pollen and fine dust than standard filters (50–60%).

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Reference FLEXITC2-1

Data sheet

Manufacturer of MVHR: Flexit
Manufacturer: CleanFilter
Model: L4X
S4X
Model size: L4
S4
Air handling unit: FLEXIT L4X/S4X (VG400)
Filter dimensions: 257x220x20
257x220x48
Class EN779: F7+G4+G3
Class ISO16890: ePM1 70%
Protection level: High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust.
Quantity of filters: 3
Advantages: German filtration material – hygienic (VDI 6022) and PFAS-free, for cleaner and safer air
ISO 16890 tested – performance verified by an accredited laboratory in Germany
Made in the EU – reliable quality and strict safety standards
Maximum protection – ePM1 70% removes up to 40% more smog, pollen and fine dust than standard filters (50–60%).
Manufacturer product number: 12318
12318
Google category ID: 3573
Product type: Filters for Air Handling Units

✅ High-quality air filters – perfect indoor air quality!

The set includes: 2 pcs. of high-quality filters: F7 for supply air and G4 for extracted air filtration.
ISO 16890 classification: F7: ePM1 70%, G4: Coarse 75%

F7 class filters effectively capture fine particles such as solid smog particles, ensuring clean indoor air even in heavily polluted areas.

✅ Key benefits:

✅ Captures solid smog particles (PM2.5 and PM1)
✅ Captures all pollen particles, improving indoor air quality
✅ Ensures clean and healthy air in your indoor spaces
✅ Ideal for areas with heavy pollution: city centers, busy streets, industrial zones, and solid fuel heating districts

Why CleanFilter is the Best Choice for Your MVHR?

✅ Premium German Sandler AG Filter Material	Durable, safe, and highly efficient synthetic fibers
✅ Certified by Independent Labs	Verified performance by FIATEC, Germany — trusted quality
✅ Reliable Moisture-Resistant Frame	Built to last even in the most humid environments
✅ 100% Airtight Seal	Ensures no unfiltered air bypasses the filter
✅ Designed to Fit Your MVHR Perfectly	Compatible with equipment dimensions — no damage, full protection

✅ Filtration efficiency (F7):

Particle type	Efficiency	Examples
Coarse >10 µm	✅ >99%	Dust, pollen
PM10	✅ >93%	Mold spores, animal dander
PM2.5	✅ >80%	Combustion particles
PM1	✅ >70%	Solid smog particles, virus-carrying droplets (e.g., sneeze, cough)

⚙️ Filter construction:

⚙️ Type: MPL (deep pleat) – extra-large filtration surface
⚙️ Filtering material: premium 3-ply synthetic fiber (SANDLER AG)
⚙️ Moisture-resistant frame: cardboard or synthetic (depends on filter), works even at 100% RH; adapts to filter holders ensuring airtightness without damaging AHU construction
⚙️ Filtering material meets hygienic standards; resistant to microbial growth; certified according to VDI 6022 (Germany)

✅ Advantages compared to other filters:

✅ Moisture-resistant frame, suitable for European climates
✅ Airtight construction – filtering material firmly glued to the frame preventing particle leakage
✅ Adapts perfectly to ventilation unit construction without damage (especially EPP casings)
✅ Made in the EU and tested according to ISO 16890 – many cheaper filters from China lack testing and only have theoretical efficiency
✅ Made from premium 3-ply synthetic material – safe, durable, and high dust holding capacity
✅ High filtration efficiency: ePM1 70% (higher than many analog filters rated at 55% or lower)

⏳ Replacement period: depends on outdoor air contamination. Expected service life: 4–6 months. Do not wash or clean. Single use only.

⚙️ Additional information:

Packing: filters packed in plastic film suitable for long-term storage
Warranty: 2-year warranty if stored properly in original packaging
Storage conditions: indoor, relative humidity <60%, low dust
Made in the EU

✅ Ordering more than 10 pcs.?
Contact us for discounts and delivery terms: [email protected]

✅ Filter Maintenance Recommendations

⏳ When to Replace Filters?

Filter contamination is monitored by a timer in the control unit. Replacement alerts appear on the display or in the mobile app.
⚠️ A filter alert is just a reminder — your AHU will continue operating normally.
The replacement frequency depends on outdoor air quality. If you live near busy roads, gravel paths, construction sites, industrial zones, or farmland, you may need to replace filters 1.5–2× more often.
Most manufacturers recommend replacing filters at least twice a year: before and after the heating season.

⚙️ Recommended Filter Replacement Intervals:

Filter Type	Suggested Replacement
Activated carbon (F7-AC)	every 3 months
F7–F9	every 4–6 months
M5 / G4	every 5–8 months

Using a G4 prefilter can extend F7–F9 filter lifespan by 2–3 months.

Return air filters (extract side) may be replaced less frequently than supply air filters (F7, F7/AC).

♻️ Reusable Filter Types

Wire-frame filters and filter media pads (cut-to-size materials) can be vacuumed every 2–3 months, up to 2–3 times before replacement — if permitted in your unit's manual.
However, panel and pocket filters are strictly single-use. Vacuuming or washing them may damage the filter and reduce efficiency. Fine dust gets trapped in the inner layers and cannot be removed.

⚙️ Step-by-Step Filter Replacement

Check your user manual if replacing filters for the first time.
Turn off the AHU and wait until all fans stop rotating.
Remove the front panel or filter cover.
Take out the old filters.
Vacuum inside the unit if possible and wipe down filter holders with a damp cloth.
Inspect and clean other AHU components if needed — such as rotor belt, heat exchanger, fan blades, etc.
Install new filters carefully:
- Check airflow direction — arrows on the filters must match the AHU’s airflow.
- Typically, filters are installed before the heat exchanger; arrows should point inward toward the center.
- If there are 3 filters and the F7/F8 filter is on the opposite side of the exchanger from G4, its arrow must point away from the exchanger.
- Incorrect orientation can increase airflow resistance by up to 15%.
If using different filter types (e.g. F7 and G4), install F7 on the outdoor air side and G4 on the extract side. The outdoor air duct is usually insulated; the extract duct is not. Refer to the manual and note whether your unit is left- or right-handed.
After installation, close the cover and restart the unit.
Reset the filter timer using the control device, according to the user manual.

❌ Do Not Use the Unit Without Filters

Running your ventilation unit without filters will clog the heat exchanger and contaminate the entire system. It will also void your warranty.

⏳ Why Timely Filter Replacement Matters

Dirty filters increase airflow resistance, reduce airflow, raise energy consumption, and increase operating noise. Replacing them on time ensures efficiency and extends system life.

Watch the instructional video on general filter replacement:

✅ Why choose us?

⚙️ Advantage	⚙️ Description
✅ Experience & support	Our consultants have extensive experience in HVAC manufacturing and service.
✅ Wide selection	We offer a variety of filter types – including activated carbon and energy-efficient options – for most AHUs.
✅ Fast delivery	With 40,000+ filters in stock, we ship on the same or next business day.
✅ Premium materials	Filtering media from SANDLER AG (Germany) offers high dust-holding capacity and performance.
✅ Sealed for quality	All filters, including G4 class, are tightly sealed to prevent air leaks.
✅ Competitive prices	Thanks to our direct factory supply and large volumes, we offer some of the best filter prices in the EU.
⚙️ EU-made	Most filters sold in Europe are made in China using low-grade materials. Ours are produced in the EU.
⏳ Certified performance	Efficiency tested according to ISO 16890 in an accredited German laboratory.

Warehouse with filters

Filter is a replaceable component of any ventilation equipment, therefore sustainable production and logistics play a key role.

♻️ Production:

✔️ Benefit	Description
✨ High-quality materials	3-ply filtering material with larger dust-holding capacity means longer filter life and less material usage.
❌ No glass fiber	We avoid fragile, potentially hazardous, and non-recyclable glass fiber materials.
♻️ Recycled cardboard frames	Panel filter frames are made from moisture-resistant cardboard with maximum recycled content.
✔️ Renewable energy	Production plants run on renewable energy sources.
✔️ Eco plastic frames	Zehnder ComfoAir filter frames contain over 80% organic material.
⚙️ Energy-efficient options	We offer energy-efficient filters lasting 1.3-2 times longer than traditional ones.
✨ Less glue usage	Patented technology reduces glue consumption by 30-50% compared to other filters.

⏳ Shorter delivery distance:

Materials sourced from manufacturers in EU countries.
Filters made in the EU (while over 80% of market filters come from China or other Asian countries).
Direct delivery from production warehouses.

We are constantly searching for ways to provide more sustainability to your filter!

⚠️ PFAS chemicals have been used in a wide range of products since the 1940s. During production or use, PFAS can migrate into soil, water, and air. Most of these chemicals are practically non-degradable. Numerous scientific studies indicate that PFAS chemicals may pose risks to human and animal health.

♻️ Major Health Risks:

✔️ Risk	✨ Description
✅ Heart Disease	PFAS may increase the risk of heart-related illnesses.
✅ Reproductive Disorders	Can affect hormone systems, causing infertility and other reproductive issues.
✅ Neurological Effects	Linked to brain development disorders and cognitive impairments in children.
✅ Increased Cancer Risk	Evidence suggests PFAS may raise the risk of certain cancers.

♻️ Main Products Containing PFAS:

♻️ CleanFilter Solution

✔️ Healthier indoor air. PFAS chemicals do not enter the air or spread throughout your rooms.
✔️ Complies with the latest standards. Our filters meet current safety requirements and forthcoming regulations regarding PFAS materials.
✔️ Excellent performance. The synthetic filtering material offers durability and high efficiency without harmful additives.
✔️ Environmental protection. Choosing PFAS-free filters helps reduce pollution and protect public health.

Vores filtre er alternative produkter af høj kvalitet og er ikke fremstillet af de oprindelige producenter af ventilationsaggregater eller på deres vegne. Alle anvendte varemærker er udelukkende til identifikationsformål for at angive kompatibilitet. Vores filtre overholder ISO 16890-standarderne, er fremstillet af certificerede tyske materialer, og deres effektivitet er uafhængigt testet i eksterne laboratorier. Derudover er vores filtermaterialer fri for PFAS og andre skadelige stoffer, hvilket sikrer, at luften i dine lokaler forbliver sund og sikker. Alle vores filtre er udelukkende fremstillet i EU.