£BMW 3 Series E90 E91 1 Pollen Microfilter Filter Housing Bottom Part Cover

BMW 3 Series E90 E91 1 Pollen Microfilter Filter Housing Bottom Part Cover is a component of the ventilation system from the Cabin, pollen filters group, responsible for properly directing air to the microfilter and protecting the cowl area from contaminants. This practical solution helps maintain stable operating conditions for the ventilation and air conditioning system, thereby improving driving comfort in your BMW.

Specifications and technical data

• SKU: 6924277-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6924277
• Substitutable numbers: 64316924277, 6924277, BG
• Category: Pollen Filters

Function and role of the microfilter housing

The lower microfilter housing in the BMW 3 Series E90/E91 is responsible for the airtight seating of the filter element and the proper direction of the airflow drawn from under the cowl. A correctly selected component:

• ensures stable mounting of the microfilter in the factory installation location,
• limits the ingress of leaves, dust, and moisture into the filter chamber,
• supports even airflow through the filter medium,
• reduces the risk of window fogging thanks to the efficient operation of the ventilation system.

As a result, the air conditioning and ventilation system can operate under predictable conditions, and the cabin remains better protected against external contaminants.

Compatibility and fitment for BMW

The housing has been designed as a component dedicated to the cowl structure of the BMW 3 Series E90/E91 generation, which translates into precise fitment with factory mounting points. The use of original geometry:

• facilitates installation without the need for modifications,
• ensures compatibility with the factory water drainage system,
• minimizes the risk of unwanted vibrations and noise in the cowl area.

Such fitment is particularly important for components working with cabin, pollen filters, where airtightness and proper airflow have a direct impact on filtration efficiency.

Characteristics of the used component

The offered lower microfilter housing comes from disassembly, which means it is a used part that retains the structural functionality intended by the manufacturer. This type of component is a good choice when:

• the original housing has cracked, deformed, or the mounts have corroded,
• leaks appear in the cowl area affecting the operation of the ventilation,
• you want to restore the factory configuration of the air filtration system.

Using parts from the secondary market allows you to maintain compliance with the factory design while optimizing service costs.

Benefits of a properly functioning microfilter housing

A functional lower microfilter housing in the BMW E90/E91 translates into a number of practical operational benefits:

• more stable operation of the heating and air conditioning system thanks to controlled airflow,
• better protection of the filter element against excessive dirt,
• limitation of moisture ingress into the cowl zone, which can support the durability of electrical components in this area,
• maintenance of predictable operating conditions for the ventilation system, which promotes driver and passenger comfort.

This is particularly important in vehicles used year-round, where the ventilation system works intensively in both the summer and winter seasons.

Expansion of the filtration system and eco-approach

If you are planning a comprehensive repair or upgrade of the cowl area in your BMW and need other elements from the same group, such as additional housings, air guides, or covers working with the ventilation system, check the available parts in the BMW Cabin, pollen filters category.

If you are interested in how the use of used components can support the reduction of the carbon footprint while maintaining appropriate vehicle performance, it is worth reading the article Eco-tuning in practice: how to increase performance while reducing the carbon footprint thanks to recycled parts, which discusses a practical approach to selecting parts from the secondary market.