Genuine filter set for Flexit S4 and L4 series heat recovery units. This set includes two high-efficiency F7 grade filters (ePM1 55%), which are key to maintaining air purity in your home and optimal performance of the ventilation system. The filters are designed to precisely fit S4 models and horizontal L4 versions.
Why Choose Original S4/L4 Filters?
Healthy Allergen-Free Environment
Regular filter replacement is essential for allergy sufferers. Genuine Flexit filters capture microscopic impurities, significantly improving air quality in bedrooms and children's rooms.
Savings and Unit Longevity
A clogged filter forces the unit to run at higher speeds, increasing electricity consumption. By using genuine spare parts, you protect your investment in heat recovery.
When to Change Nordic S4/L4 Filters?
The recommended filter replacement interval is 1 to 2 times per year. If your property is located near a busy road, construction site, or in an agricultural area, we recommend checking every 6 months.
The Flexit GO app will notify you in time for service based on real fan operating hours.
Technical Specification
| Parameter | Value |
|---|---|
| Compatibility | Flexit Nordic S4, Nordic L4 |
| Package Contents | 2× compact panel filter (set) |
| Filtration Class | F7 (ISO ePM1 55%) |
| Filter Dimensions (W×H×D) | 247 × 365 × 31 mm |
| Function | Supply and exhaust air filtration |
| Manufacturer | Flexit AS |
| Article Number (Art. no) | 12318 / 116177 |
Ensure Peak Performance for Your HRV System
Genuine Flexit filters guarantee that your system will function exactly as it was designed – quietly, economically, and with maximum regard for your health.