L4X/S4X (VG400) FILTER SET (257X220X48 + 257X220X20)

Buy FLEXIT L4X/S4X (VG400) Filter Set 257x220x48 + 257x220x20 online. This complete two-filter set delivers high-efficiency F7 filtration for both supply and extract air in your FLEXIT L4X/S4X or VG400 recuperator, ensuring cleaner indoor air and stable system performance.

What This Filter Set Is

This replacement filter set is designed specifically for FLEXIT L4X/S4X (VG400) heat recovery ventilation units. The set includes two F7 class filters corresponding to ePM1 70% under ISO 16890, providing effective filtration for both incoming outdoor air and outgoing extract air. These are compatible aftermarket replacement filters that match the original specifications and dimensions.

Filter Class Comparison

Understanding filter classes helps you choose the right protection level for your indoor environment:

• F7 (ePM1 70%): Captures ultra-fine particles down to 0.3 μm, including pollen, fine dust, bacteria, and diesel soot. Ideal for homes in urban areas, near busy roads, or where allergy sufferers need cleaner air.
• M5 (ePM10 55%): Traps medium-sized particles around 10 μm, such as coarse dust and larger pollen grains. Suitable for rural areas with lower pollution levels.

For FLEXIT L4X/S4X units, we recommend the F7+F7 set for maximum indoor air quality and effective protection against fine particulate matter.

Product Specifications

• Compatible model: FLEXIT L4X/S4X (VG400)
• Dimensions: 257x220x48 mm + 257x220x20 mm
• Filter class: F7 + F7 (ePM1 70%)
• Set contents: 2 filters (supply and extract)
• Country of origin: Lithuania
• Frame material: Moisture-resistant double-layered laminated cardboard
• Certifications: ISO 16890, EN 779:2012

Why Choose These Filters

• Precise fit for FLEXIT L4X/S4X and VG400 recuperators
• Complete set with both supply and extract filters included
• High F7 filtration efficiency for cleaner indoor air
• Stable airflow and consistent system performance
• Durable moisture-resistant cardboard frame
• Manufactured to ISO 16890 and EN 779:2012 standards
• Reliable quality from EU production

DEEP PLEAT Technology

Our FLEXIT L4X/S4X filters feature advanced DEEP PLEAT construction, which increases the filtration surface area while maintaining compact dimensions. This design ensures efficient particle capture without restricting airflow through your ventilation system.

• Maximized filtration surface area
• Maintains stable airflow
• Efficient fine dust capture
• Extended filter service life

ECO Green Materials

These replacement filters are manufactured using ECO Green materials that deliver reliable performance while minimizing environmental impact. The moisture-resistant cardboard frame provides structural stability throughout the filter's service life, and the materials meet European standards for indoor air quality applications.

Recommended Replacement Interval

Replace your FLEXIT L4X/S4X recuperator filters 2 to 3 times per year, depending on local air quality, usage patterns, and environmental conditions. Regular filter replacement maintains cleaner indoor air, protects consistent airflow through your HRV unit, and reduces unnecessary strain on the ventilation system.

Frequently Asked Questions

How often should I replace these filters?

Replace filters every 4 to 6 months, or 2 to 3 times per year for optimal performance.

What is the difference between F7 and M5?

F7 filters capture ultra-fine particles down to 0.3 μm, while M5 filters trap medium-sized particles around 10 μm.

Are these filters compatible with my FLEXIT unit?

Yes, this set is designed specifically for FLEXIT L4X/S4X and VG400 recuperator models.

How many filters are included in the set?

The set includes 2 filters: one for supply air and one for extract air.

Are these original or compatible replacement filters?

These are high-quality compatible aftermarket replacement filters that match original specifications and dimensions.

Looking for more options? Browse our complete range of Flexit HRV Filters or explore all recuperator filters available for fast EU delivery.

Buy FLEXIT L4X/S4X (VG400) Filter Set 257x220x48 + 257x220x20 online. Fast EU delivery and reliable compatibility for your heat recovery ventilation system.