BMW E90 E91 Pollen Microfilter Filter Housing Bottom Part Cover

BMW E90 E91 Pollen Microfilter Filter Housing Bottom Part Cover is an original ventilation system component by BMW, designed to protect the pollen filter cartridge from contaminants and moisture. The carefully engineered housing ensures stable filter seating and helps maintain proper airflow into the vehicle interior, which translates into user comfort and efficient operation of the ventilation system.

Specifications and technical data

• SKU: 6924277
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6924277
• Substitutable numbers: 64316924277, 6924277
• Category: Pollen Filters

Purpose and function in the ventilation system

The cabin filter cover in BMW E84, E90, E92, and E93 series models is responsible for tightly sealing the space where the filter cartridge is mounted. This ensures that the air drawn into the cabin passes through the pollen filter rather than bypassing it, which limits the ingress of dust, pollen, and fine particles into the car interior.

This component is particularly important in vehicles operated in urban conditions, where the concentration of dust and pollutants is higher. A properly selected and installed cabin filter housing supports the stable operation of the ventilation, air conditioning, and heating systems, and also facilitates periodic replacement of the filter cartridge.

Benefits of using an original BMW cover

Using an original BMW cabin filter cover offers a number of practical advantages:

• precise fit to the filter housing in dedicated E84, E90, E92, E93 series models,
• stable retention of the cabin filter cartridge in the correct operating position,
• reduction of air bypass and improved air filtration efficiency,
• easier, repeatable installation and removal during ventilation system servicing,
• consistency with the factory design of the filter chamber in BMW cars.

By maintaining the original geometry and mounting points, the housing works with factory cowl components and seals, which helps maintain predictable operating conditions for the cabin filter.

Category Cabin and pollen filters – the role of the cover

The cabin filter cover is an integral part of the Cabin and pollen filters group, which is responsible for air quality in the cabin. Although it is not the filter cartridge itself, it is the component that determines whether the filter operates under the designed flow and sealing conditions. In the event of damage, deformation, or missing fasteners, even a high-quality filter cartridge will not be able to fully perform its function.

Selecting the correct housing is particularly important after repairs in the cowl area, replacement of ventilation system components, or after collisions that may have damaged the filter mounts. Replacing a worn or leaky cover with a functional part helps restore proper ventilation system operating conditions and reduces window fogging as well as unpleasant odors resulting from the accumulation of contaminants in the filter chamber.

Condition and use in vehicle service

The offered cover belongs to the group of used parts, which makes it an attractive solution for maintenance repairs and budget-friendly servicing of BMW cars. In practice, it is a frequently chosen option for:

• restoring the completeness of the cabin filtration system after previous repairs,
• eliminating leaks in the filter chamber area,
• restoring the factory configuration after improper modifications.

A properly selected cabin filter cover helps maintain predictable operating conditions for the ventilation system, which is important for both driving comfort and the durability of other ventilation system components.

Complementary items from the same group

If you are planning a comprehensive repair or upgrade of the ventilation zone in your BMW and need other items from the same group, such as filter cartridges, additional covers, or mounting elements, check the available parts in the BMW Cabin and pollen filters category.

For drivers considering the wider use of used parts in servicing premium segment vehicles, practical tips on component selection and assessing their cost-effectiveness may also be useful – you can find them in the article Used car parts for Mini Cooper – a way for style and savings, which discusses the approach to purchasing secondary market components in terms of quality and costs.