Cabin Filter FILTRON K 1121

Cabin Filter FILTRON K 1121
FILTRON K 1121 is a high-quality cabin filter designed to ensure clean, contaminant-free air inside the vehicle cabin. The product comes from the renowned Polish manufacturer Filtron—a brand highly regarded by both mechanics and individual users for its excellent value for money and compliance with OE (Original Equipment) standards.

Purpose and functions of the K 1121 cabin filter
The cabin filter plays a crucial role in protecting passengers’ health and ensuring the proper operation of the ventilation and air conditioning system. Its main functions include:

• Trapping plant pollen, dust, soot, and other fine particulate matter

• Purifying the air entering the cabin

• Improving travel comfort, especially for allergy sufferers and those sensitive to air pollution

• Reducing the risk of interior window fogging

PROTECT+ Technology
The K1121 filter is equipped with a special PROTECT+ coating that inhibits the growth of bacteria, fungi, and mold on the filter surface. This:

• Reduces the risk of unpleasant odors

• Improves air quality in the cabin

• Enhances hygiene in the ventilation system, especially during heavy air conditioning use

Technical Specifications

• Filter type: Pollen filter (standard, without activated carbon)

• Filter media: High-quality synthetic non-woven fabric with protective layer

• Filtration efficiency: Captures most solid particles larger than 2.5 microns (PM2.5)

• For even higher effectiveness (e.g., protection against smog or exhaust gases), the K1121A version with activated carbon layer is also available.

Replacement Recommendations
To maintain optimal filter performance and protect passenger health, it is recommended to replace the filter:

• Every 15,000 km, or

• Once every 12 months,

• More frequently when driving in urban areas, high dust conditions, or during smog events.

Regular replacement improves airflow efficiency, protects the air conditioning system, and reduces moisture buildup, which can promote mold growth.

Application and Installation
The K1121 filter fits selected vehicle models—typically installed in the cowl area or behind the passenger glove compartment. Installation is straightforward, but it is important to ensure the correct airflow direction, indicated by arrows on the filter housing.