NIBE FLM 40 4xG4 Filter set (Multipack)

Reference: NIEFLM40G4

6.18 €
Available now – Ready to ship

Ex VAT: 6.18 €

Filter dimensions 340x270
Class EN779 G4x4
Class ISO16890 Coarse 65%
Protection level Basic: larger solid particles, dust, fluff.
Quantity of filters 4
Advantages check German filtration material – hygienic (VDI 6022) and PFAS-free for cleaner, safer air.
check Low airflow resistance: longer servicing term, lower energy consumption.
check Made in the EU – quality and safety.
Remarks check ℹ️ This filter set protects the MVHR from larger particles. For finer filtration (pollen, smog), use an F7 supply air filter, available in our shop.

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NIEFLM40G4

Data sheet

Manufacturer of MVHR
NIBE
Manufacturer
CleanFilter
Model
FLM
Model size
40
Air handling unit
NIBE FLM 40
Filter dimensions
340x270
Class EN779
G4x4
Class ISO16890
Coarse 65%
Protection level
Basic: larger solid particles, dust, fluff.
Quantity of filters
4
Advantages
German filtration material – hygienic (VDI 6022) and PFAS-free for cleaner, safer air.
Low airflow resistance: longer servicing term, lower energy consumption.
Made in the EU – quality and safety.
Remarks
ℹ️ This filter set protects the MVHR from larger particles. For finer filtration (pollen, smog), use an F7 supply air filter, available in our shop.
Google category ID
3573
Product type
Filters for Heat Pumps

✅ 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 TypeSuggested Replacement
Activated carbon (F7-AC)every 3 months
F7–F9every 4–6 months
M5 / G4every 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

  1. Check your user manual if replacing filters for the first time.
  2. Turn off the AHU and wait until all fans stop rotating.
  3. Remove the front panel or filter cover.
  4. Take out the old filters.
  5. Vacuum inside the unit if possible and wipe down filter holders with a damp cloth.
  6. Inspect and clean other AHU components if needed — such as rotor belt, heat exchanger, fan blades, etc.
  7. 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%.
  8. 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.
  9. After installation, close the cover and restart the unit.
  10. 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 & supportOur consultants have extensive experience in HVAC manufacturing and service.
✅ Wide selectionWe offer a variety of filter types – including activated carbon and energy-efficient options – for most AHUs.
✅ Fast deliveryWith 40,000+ filters in stock, we ship on the same or next business day.
✅ Premium materialsFiltering media from SANDLER AG (Germany) offers high dust-holding capacity and performance.
✅ Sealed for qualityAll filters, including G4 class, are tightly sealed to prevent air leaks.
✅ Competitive pricesThanks to our direct factory supply and large volumes, we offer some of the best filter prices in the EU.
⚙️ EU-madeMost filters sold in Europe are made in China using low-grade materials. Ours are produced in the EU.
⏳ Certified performanceEfficiency 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:

✔️ BenefitDescription
✨ High-quality materials3-ply filtering material with larger dust-holding capacity means longer filter life and less material usage.
❌ No glass fiberWe avoid fragile, potentially hazardous, and non-recyclable glass fiber materials.
♻️ Recycled cardboard framesPanel filter frames are made from moisture-resistant cardboard with maximum recycled content.
✔️ Renewable energyProduction plants run on renewable energy sources.
✔️ Eco plastic framesZehnder ComfoAir filter frames contain over 80% organic material.
⚙️ Energy-efficient optionsWe offer energy-efficient filters lasting 1.3-2 times longer than traditional ones.
✨ Less glue usagePatented 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 DiseasePFAS may increase the risk of heart-related illnesses.
✅ Reproductive DisordersCan affect hormone systems, causing infertility and other reproductive issues.
✅ Neurological EffectsLinked to brain development disorders and cognitive impairments in children.
✅ Increased Cancer RiskEvidence suggests PFAS may raise the risk of certain cancers.

♻️ Main Products Containing PFAS:

PFAS Health Risks
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.