The Stiebel Eltron 234148 Filter Mat Set FMK M5-2 180 is a replacement filter cassette set for supply ventilation in central ventilation systems. This white filter set features filter class M5 with an efficiency of ePM10 ≥ 50 percent and is made from durable, unbreakable polyester fibers with a partially progressive structure for optimal air filtration. With a size of 180 millimeters, this filter cassette effectively captures air particles and ensures a consistent airflow in ventilation systems. The product serves as a successor model for compatible Stiebel Eltron ventilation units and offers reliable filter performance with a focus on durability and consistent air quality control. Each unit contains a complete filter set, ready for installation in suitable ventilation systems. The design emphasizes practical functionality with easy replacement procedures, supporting long-term system maintenance without the need for special tools. This filter cassette meets standard ventilation requirements for residential and commercial applications where controlled supply air filtration is necessary. The construction materials ensure resistance to typical environmental influences in ventilation systems and contribute to extended service intervals between replacements. The product maintains compatibility with specified Stiebel Eltron ventilation units and delivers expected filter performance according to M5 classification standards.