pollenfilter

Pollenfilter, also known as a cabin air filter, is an air filtration device designed to remove pollen, dust, mold spores, and other particulates from the air entering a vehicle cab or a building’s ventilation system. Its purpose is to improve indoor air quality for occupants and to protect HVAC components from dust buildup.

In automotive use, the filter sits in the HVAC intake, typically behind the glove compartment, and cleans air before it flows into the passenger compartment. In buildings, it is part of the central air conditioning or heating system. Construction commonly uses pleated media made of paper or synthetic fibers, enclosed in a frame to create a seal. Many filters include an activated carbon layer to reduce odors and some gaseous pollutants; anti-microbial coatings may also be used in certain environments.

Filtration performance depends on media and design. Pollen grains are generally tens of micrometers in diameter, so cabin filters are designed to capture the majority of pollen and fine particulates before air enters the cabin. Some filters are rated by consumer or industry standards and may include carbon or higher-efficiency layers; automotive filters rarely meet true HEPA standards, though higher-grade options exist.

Maintenance and replacement are determined by manufacturer guidance and environmental conditions. Replacement intervals commonly range from about 12,000 to 30,000 miles (20,000–50,000 kilometers) for cars and 6 to 12 months for buildings, depending on usage and pollution levels. Signs of a clogged filter include reduced airflow, musty odors, increased allergy symptoms, and more frequent window fogging. When replacing, ensure the filter is installed with the correct airflow orientation and a tight seal.