S3R / K3R FILTER SET (285X130X50)

Buy Flexit S3R / K3R Filter Set 285x130x50 online for reliable HRV performance. This complete compatible replacement filter set includes two F7 class filters, delivering efficient filtration for both incoming and outgoing air in your Flexit S3R and K3R ventilation units.

This filter set is specifically designed for Flexit S3R and K3R recuperator models. Each set contains two F7 filters (ePM1 70% according to ISO 16890), providing superior protection against fine particles while maintaining stable airflow. The filters fit perfectly into the original mounting positions, ensuring proper system operation and long-term reliability.

Filter Class Comparison

Understanding filter classes helps you choose the right protection level for your indoor air quality needs:

• M5 filters (ePM10 55%) capture medium-sized particles down to 10 μm, including pollen and larger dust particles
• F7 filters (ePM1 70%) capture ultra-fine particles down to 0.3 μm, including fine dust, bacteria, and combustion particles
• F7 filters provide significantly better protection against fine particulate matter and urban air pollution

For optimal indoor air quality in urban environments or areas with air quality concerns, the F7+F7 configuration offers the best protection.

Product Specifications

• Compatible models: Flexit S3R, Flexit K3R
• Dimensions: 285x130x50 mm
• Set contents: 2 x F7 filters (ePM1 70%)
• Country of origin: Lithuania
• Frame material: Moisture-resistant double-layer laminated cardboard
• Technology: SafeLock tec secure mounting system
• Certifications: ISO 16890, EN 779:2012

Why Choose These Filters

• Precise fit for Flexit S3R and K3R recuperator units
• Complete set with both filters included for full system maintenance
• F7 class filtration captures fine particles effectively
• Moisture-resistant construction prevents frame degradation
• SafeLock tec ensures secure installation
• Manufactured to ISO 16890 and EN 779:2012 standards
• Maintains optimal airflow throughout the service life

DEEP PLEAT Technology

These filters feature DEEP PLEAT technology, which maximizes the filtration surface area within the compact 285x130x50 mm frame. More pleats mean better performance and longer service intervals.

• Increased filtration surface area
• Consistent airflow resistance
• Efficient particle capture
• Extended filter service life

ECO Green Materials

Manufactured using ECO Green materials and sustainable production practices, these filters deliver reliable performance without compromising environmental responsibility. The moisture-resistant cardboard frame provides structural integrity while remaining fully recyclable at end of life.

Recommended Replacement Interval

Replace your Flexit S3R / K3R filters 2 to 3 times per year, depending on local air quality and system usage patterns. Regular filter replacement maintains clean indoor air, protects airflow efficiency, and reduces strain on your recuperator unit. Set a reminder to inspect filters every 4 to 6 months.

Frequently Asked Questions

How often should I replace these filters?

Replace filters every 4 to 6 months, or 2 to 3 times per year depending on air quality conditions.

What is the difference between M5 and F7?

F7 filters capture finer particles down to 0.3 μm, while M5 filters target larger particles down to 10 μm.

Are these filters compatible with my Flexit S3R or K3R unit?

Yes, these 285x130x50 mm filters are specifically designed for Flexit S3R and K3R recuperator models.

How many filters are included in the set?

Each set includes two F7 class filters, providing complete filtration for both air streams.

Are these original or compatible replacement filters?

These are high-quality compatible replacement filters manufactured to meet ISO 16890 standards.

What does SafeLock tec mean?

SafeLock tec is a secure mounting system that ensures filters stay properly positioned during operation.

Browse our complete range of Flexit HRV filters or explore all recuperator filters available for fast EU delivery.

Buy Flexit S3R / K3R Filter Set 285x130x50 online today. Complete your ventilation system maintenance with filters engineered for reliable performance and fast EU delivery.