SL4R FILTER SET (350X185X50)

Buy SL4R Filter Set (350X185X50) online at filters1.eu. Complete dual F7 filter set designed for precise compatibility with Flexit SL4R recuperators, ensuring efficient fine particle filtration and reliable indoor air quality.

This SL4R filter set delivers high-performance air filtration for Flexit SL4R heat recovery ventilation units. The complete set includes two F7 filters (ePM1 70% according to ISO 16890), providing effective protection against ultra-fine airborne particles in both supply and extract airstreams. Manufactured in Lithuania with moisture-resistant double-layered laminated cardboard frames and SafeLock technology, these replacement filters maintain optimal airflow while capturing harmful pollutants down to 0.3 μm.

Filter Class Comparison

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

• M5 filters (ePM10 55%) capture medium-sized particles around 10 μm, including coarse dust and larger pollen grains
• F7 filters (ePM1 70%) trap ultra-fine particles down to 0.3 μm, including fine dust, combustion particles, bacteria, and most airborne allergens
• F7 filtration provides superior protection in urban environments, areas with high traffic pollution, or homes with allergy sufferers

This dual F7 configuration offers maximum fine particle protection on both incoming fresh air and outgoing extract air.

Product Specifications

• Compatible model: Flexit SL4R
• Dimensions: 350X185X50 mm
• Set contents: 2 × F7 filters (ePM1 70%)
• Country of origin: Lithuania
• Frame material: Moisture-proof double-layered laminated cardboard
• Technology: SafeLock secure fitting system
• Certifications: ISO 16890 compliant

Why Choose These Filters

• Exact dimensional match for Flexit SL4R units ensures proper seal and airflow
• Complete dual-filter set simplifies maintenance and ensures balanced system performance
• F7 filtration class captures ultra-fine particles that lower-grade filters miss
• Moisture-resistant cardboard frames prevent deterioration in humid conditions
• SafeLock technology ensures secure installation without air bypass
• ISO 16890 compliance guarantees tested and verified filtration performance
• Compatible aftermarket alternative delivering reliable protection at competitive value

DEEP PLEAT Technology

Our DEEP PLEAT filter media construction maximizes filtration surface area within the standard 350X185X50 dimensions, delivering superior particle capture without restricting airflow through your Flexit SL4R system.

• Extended media surface area for enhanced dust holding capacity
• Consistent airflow throughout the filter service life
• Efficient fine particle capture down to 0.3 μm
• Longer service intervals between replacements

ECO Green Materials

These SL4R replacement filters use ECO Green materials that balance environmental responsibility with filtration performance. The moisture-resistant laminated cardboard frames provide structural stability while remaining recyclable at end of life, supporting practical sustainability in everyday ventilation maintenance.

Recommended Replacement Interval

Replace your Flexit SL4R filters 2 to 3 times per year depending on local air quality, usage patterns, and seasonal pollen levels. Regular replacement maintains clean indoor air quality, protects optimal airflow rates, and reduces strain on your heat recovery ventilation system, extending unit longevity and energy efficiency.

Frequently Asked Questions

How often should I replace these filters?

Replace every 4 to 6 months, or 2 to 3 times annually depending on air quality and system usage.

What is the difference between M5 and F7 filters?

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 SL4R unit?

Yes, these 350X185X50 mm filters are designed specifically for precise fit in Flexit SL4R recuperators.

How many filters are included in the set?

The complete set includes two F7 filters, covering both supply and extract air positions.

Are these original or compatible replacement filters?

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

For more replacement options, explore our complete Flexit HRV Filters collection or browse all recuperator filters available across major ventilation brands.

Buy SL4R Filter Set (350X185X50) online today. Fast EU delivery ensures your Flexit system continues delivering clean, filtered air without delay.