FKB Series Air Filtration Systems

System Classification

The FKB series is used when defined air filtration under medium dust conditions is required and a compact, closed system solution must be implemented.

Typical applications include construction machinery, mobile equipment and off-highway machines operating under varying dust loads and changing working conditions.

Unlike individual air filter elements, the FKB series represents a complete system consisting of housing, airflow routing and filtration.

Cycloflow System Design and Filtration Principle

The Donaldson FKB series uses the Cycloflow principle for two-stage filtration. The housing geometry creates a rotational airflow within the system.

The resulting centrifugal force causes heavier particles to be separated and directed toward the housing wall before reaching the filter element. This integrated pre-separation relieves the main filter element and supports stable filtration under medium dust conditions.

The second stage is performed by the filter element, ensuring consistent and defined air filtration within the system.

System selection is based on airflow, installation space, connection geometry and application requirements.

Technical Features

The FKB series combines several design characteristics for use in construction machinery:

• Two-stage compact system: pre-separation and main filtration within a single housing
• Cycloflow airflow design: controlled airflow distribution inside the system
• Corrosion-resistant housing: non-metal design for reduced sensitivity to environmental influences and vibration
• Compact design: suitable for limited installation space

Typical Donaldson reference ranges within the FKB series often begin with B04, B05 or B06, indicating different housing sizes and airflow capacities.

Applications and Operating Conditions

FKB air filtration systems are used in applications requiring a balanced combination of system size, filtration performance and integration.

Typical use cases include earthmoving, construction site operations and machinery exposed to medium dust levels and variable working conditions.

The series is used when stable filtration is required without external pre-cleaner systems.

System Comparison within the Donaldson Portfolio

The FKB series is positioned between compact systems and heavy-duty solutions within the Donaldson air filtration range.

• EPB-ERB2 series: compact systems with RadialSeal for lower dust conditions
• FKB series: two-stage Cycloflow systems for medium dust conditions
• PSD series: systems with integrated pre-cleaning for high dust conditions

Compared to DuraLite systems, the focus of the FKB series is not on reduced weight, but on more stable airflow management and defined filtration performance.

Position within Air Filtration Systems

The FKB series is part of the Filters for Construction Machinery and is used within Construction Machinery Air Filters in the Complete Air Filters segment.

It belongs to the Donaldson Air Filtration Systems and is used within these system series for applications with medium dust conditions.

System Environment and Maintenance

The FKB series belongs to Construction Machinery Air Filters. For maintenance and service, correct identification of components based on series designation, housing configuration and reference number is required.

Identification Before Purchase

Before ordering, the series designation, reference number, machine model and installation conditions must be verified.

Check before purchase

• FKB series designation
• Reference number of the existing system
• Machine model and series
• Installation space and connection geometry

Technical Support

Selection of the correct FKB air filtration system is based on technical system identification and the specific operating requirements of the machine.