Bosch P3891WS Workshop Cabin Air Filter

The Bosch P3891WS Workshop Cabin Air Filter is specifically engineered to ensure passengers breathe fresher, cleaner air by preventing dirt and environmental particles from entering your vehicle's heating, ventilation, and air conditioning (HVAC) system. This particulate filter offers a 99% efficiency rate at 3 microns or greater in capturing dirt and other environmental particles.

Multi-Layer Filtration Technology:

• First Layer: Non-woven pre-filter layer captures larger contaminant particles
• Second Layer: Electrostatically charged microfiber layer attracts and holds elusive smaller particles
• Third Layer: Non-woven cover layers add stability to protect the microfiber layer from damage and act as an additional barrier to harmful elements

The high pleat count provides greater surface area for higher filtration capacity, and includes a foam perimeter gasket or rigid frame where specified by OE standards. The advanced design captures up to 99% of dirt and environmental particles over 3 microns, and up to 80% of particles under 3 microns, preventing them from entering the passenger cabin.

Replacement Recommendations: Cabin filters should be inspected at least once a year, with Bosch recommending replacement at manufacturer-specified intervals. Signs that you may need a new cabin air filter include reduced air flow through your HVAC system or noise coming from the fan.