Hengst E3903LB Cabin Air Filter

Hengst HEZ Cabin Air Filter E3903LB

The Hengst HEZ Cabin Air Filter E3903LB is a biofunctional cabin air filter for Mazda HVAC systems. It is built with biological filter media to help maintain cleaner air inside the vehicle cabin while matching OE-style fitment for select Mazda models.

Key Features

• Biofunctional filter media for cabin air filtration
• HEZ Cabin Air Filter product line from Hengst
• Direct-fit application for select Mazda CX-5, Mazda 3, Mazda 6, and Mazda CX-30 models
• OE reference support for applications using BDGF-61-J6X
• Part number E3903LB for catalog and fitment lookup

Product Details

Hengst HEZ Cabin Air Filter E3903LB is a replacement HVAC filter for Mazda vehicles that use a biofunctional cabin air filter specification. The biological filter media is selected for cabin air service where the factory application calls for this material type. This part cross-references OE-style numbers such as BDGF-61-J6X for the same application. It is a practical choice for drivers searching for a Mazda CX-5 cabin air filter, Mazda 3 cabin air filter, or Mazda 6 cabin air filter with the correct biofunctional specification.

The HEZ Cabin Air Filter line is Hengst’s cabin filtration offering for passenger vehicles, focused on OE-style fitment and application-specific media selection. For shoppers comparing the Hengst E3903LB against factory references, this part number is listed for multiple Mazda platforms across 2013-2025 model years.

What It Helps Address

• Dust and airborne debris entering the HVAC intake
• Reduced cabin air quality from a loaded or aging filter
• Restricted airflow through a clogged cabin filter
• Odors and contamination buildup in the ventilation path
• Incorrect replacement part selection for biofunctional Mazda applications

Fitment Notes and Installation

• Fits 2020-2025 Mazda CX-5, N/A; Material: Biofunctional; HEZ Cabin Air Filter
• Fits 2021 Mazda 3, N/A; Material: Biofunctional; With OE No. BDGF-61-J6X
• Fits 2020-2021 Mazda 6, N/A; Material: Biofunctional; HEZ Cabin Air Filter
• Fits 2021 Mazda CX-30, N/A; Material: Biofunctional; With OE No. BDGF-61-J6X
• Fits 2020 Mazda 3, N/A; Material: Biofunctional; With OE BDGF-61-J6X
• Fits 2020 Mazda CX-30, N/A; Material: Biofunctional; With OE BDGF-61-J6X
• Fits 2017-2019 Mazda 3, N/A; Compatible with biofunctional material cabin air filters.
• Fits 2014-2015 Mazda 3, N/A; Compatible with biofunctional material cabin air filters.
• Fits 2018-2019 Mazda 6, N/A; Compatible with biofunctional material cabin air filters.
• Fits 2014-2015 Mazda 6, N/A; Compatible with biofunctional material cabin air filters.
• Fits 2017-2019 Mazda CX-5, N/A; Compatible with biofunctional material cabin air filters.
• Fits 2013-2015 Mazda CX-5, N/A; Compatible with biofunctional material cabin air filters.
• Fits 2014-2015 Mazda 3 Sport, N/A; Compatible with biofunctional material cabin air filters.

Verify the vehicle’s existing cabin filter specification and OE reference before installation. The part number E3903LB should be matched to the listed Mazda application and biofunctional media requirement for proper fitment.

Quality Assurance

Hengst is an established filtration brand, and the HEZ Cabin Air Filter line is built around application-specific cabin filtration for OE-style replacement use.