Finder 7F.21.9.024.1020.0 – 7F Series Filter Fans – Reverse flow – Black version

Finder 7F.21.9.024.1020.0 – 24 V DC Reverse-Flow Exhaust Filter Fan, Size 1, 24 m³/h

The Finder 7F.21.9.024.1020.0 is a compact 24 V DC reverse-flow exhaust filter fan from the Finder 7F Series, designed to help manage heat inside industrial electrical enclosures, automation cabinets and control panels.

The corresponding Finder base model, 7F.21.9.024.1020, is a Size 1 exhaust filter fan with a nominal free-air volume of 24 m³/h and a rated power consumption of 3.6 W. The additional .0 suffix is retained in this listing to identify the requested product reference; its precise ordering significance should be confirmed against the supplier's documentation.

Unlike a standard intake filter fan, the Finder 7F.21 reverse-flow design actively extracts warm air from an electrical cabinet. This supports an effective ventilation path when paired with a suitable air inlet and helps reduce heat accumulation around electrical and electronic components.

The compact 120 × 120 mm front housing, 92 × 92 mm nominal panel cut-out and replaceable filter element make this product suitable for electrical engineers, control panel builders, OEM machine manufacturers and industrial maintenance teams.

Key Advantages

• Reverse-flow exhaust ventilation actively extracts warm air from electrical cabinets.
• 24 V DC operation suits compatible industrial control power supplies.
• 24 m³/h nominal free-air volume provides forced ventilation for suitable compact enclosures.
• 3.6 W rated power supports energy-efficient cabinet ventilation.
• Compact Size 1 design requires relatively little enclosure wall space.
• 120 × 120 mm front dimensions support installation in small control cabinets.
• 92 × 92 mm nominal panel cut-out simplifies integration into compatible panels.
• IP54 protection rating helps protect the ventilation opening against harmful dust ingress and splashing water when correctly installed.
• Replaceable filter element supports straightforward maintenance.
• Low-noise operation makes it suitable for a range of industrial environments.
• Snap-in mounting arrangement supports convenient cabinet assembly.
• Thermostat-controlled operation is possible with a suitably rated switching device.
• Finder 7F Series construction supports coordinated electrical enclosure ventilation designs.

Key Features

• Finder 7F Series enclosure ventilation accessory.
• Type 7F.21 reverse-flow exhaust filter fan.
• Extended product reference: 7F.21.9.024.1020.0.
• Corresponding base model: 7F.21.9.024.1020.
• Size 1 construction.
• 24 V DC nominal supply voltage.
• 24 m³/h nominal free-air volume.
• Approximately 14.1 CFM free-air volume.
• 3.6 W rated power consumption.
• IP54 ingress protection.
• 120 × 120 mm front housing.
• Approximately 50.4 mm overall depth.
• 92 × 92 mm nominal panel cut-out.
• Integrated DC fan motor.
• Reverse-flow air extraction.
• Replaceable filter mat.
• Suitable for panel mounting.
• Designed for electrical enclosure thermal management.

Technical Specifications

The following technical characteristics relate to the corresponding published Finder 7F.21.9.024.1020 base model. The additional .0 suffix should be verified before ordering where exact variant specifications are essential.

• Manufacturer: Finder
• Series: 7F Series
• Type: 7F.21
• Requested part number: 7F.21.9.024.1020.0
• Corresponding base model: 7F.21.9.024.1020
• Product type: Reverse-flow exhaust filter fan
• Application: Electrical enclosure ventilation
• Airflow direction: Exhaust
• Fan size: Size 1
• Nominal operating voltage: 24 V DC
• Supply type: DC
• Rated power: 3.6 W
• Nominal free-air volume: 24 m³/h
• Nominal free-air volume: Approximately 14.1 CFM
• Front housing dimensions: 120 × 120 mm
• Overall depth: Approximately 50.4 mm
• Nominal panel cut-out: 92 × 92 mm
• Ingress protection: IP54 when correctly installed
• Fan motor: Integrated DC motor
• Filter element: Replaceable
• Mounting: Enclosure wall or panel
• Installation method: Snap-in mounting
• Intended application environment: Appropriately protected electrical enclosures
• Extended .0 suffix: Exact ordering significance requires confirmation

How the Finder 7F.21 Reverse-Flow Filter Fan Works

The Finder 7F.21.9.024.1020.0 is intended to provide active air extraction from an electrical enclosure.

When the fan operates, its integrated DC motor drives airflow from inside the cabinet towards the external ventilation opening.

This helps remove warm air produced by components such as power supplies, relays, contactors, controllers and electronic modules.

Replacement air enters through a suitable inlet, creating a ventilation path through the enclosure.

The corresponding base model has a nominal 24 m³/h free-air volume. Actual airflow through an installed cabinet depends on the enclosure design, filter condition, inlet resistance and internal obstructions.

The fan should be selected according to the heat generated inside the cabinet and the required operating temperature of the installed electrical equipment.

Reverse-Flow Exhaust Versus Standard Intake Fans

The Finder 7F.21 range is designed for reverse-flow operation, while standard 7F.20 filter fans are generally used for air intake.

An intake fan introduces external air into the enclosure and allows warm air to escape through an outlet.

A reverse-flow exhaust fan actively removes air from the enclosure, with replacement air entering through a separate opening.

The preferred arrangement depends on the enclosure layout, ambient dust levels, required airflow path and environmental protection requirements.

For applications where airborne contamination is a concern, the complete ventilation design should be assessed to ensure suitable inlet filtration and cabinet protection.

24 V DC Operation for Industrial Control Systems

The Finder 7F.21.9.024.1020 base configuration uses a nominal 24 V DC electrical supply.

This makes it suitable for many industrial control panels that already incorporate a regulated 24 V DC power supply.

With a rated power consumption of 3.6 W, the fan can provide forced ventilation with a relatively low electrical demand.

The available power supply capacity, wiring polarity and protective arrangements should be checked before installation.

Important: The fan must not be connected directly to a 120 V AC or 230 V AC supply.

Compact Size 1 Enclosure Installation

The Finder Size 1 filter fan format is suitable for electrical cabinets where installation space is limited.

The corresponding base model has a 120 × 120 mm front housing and an approximate overall depth of 50.4 mm.

The nominal panel cut-out is 92 × 92 mm.

The unit should be installed in a suitable enclosure wall or panel in accordance with Finder's mounting instructions.

For effective thermal management, the exhaust fan should be positioned to encourage airflow across the cabinet's heat-generating components.

Before preparing the panel opening, installers should verify the exact dimensions and mounting requirements against the product supplied.

IP54 Protection for Electrical Enclosures

The corresponding Finder 7F.21 base model has an IP54 ingress protection rating when correctly installed.

IP54 indicates protection against harmful dust ingress and splashing water under the relevant test conditions.

The rating of the completed electrical enclosure depends on the installation of the fan, the sealing of the panel opening and the protection ratings of other cabinet components.

IP54 does not mean that the fan is suitable for immersion, high-pressure washing or unrestricted outdoor weather exposure.

Filter Inspection and Maintenance

The Finder 7F.21 filter fan incorporates a replaceable filter element.

Over time, airborne dust can accumulate within the filter and increase resistance to airflow.

Regular inspection and replacement help preserve ventilation performance and reduce the likelihood of excessive cabinet temperatures caused by restricted airflow.

The correct replacement filter should be selected according to Finder's Size 1 accessory information and the exact supplied fan assembly.

Maintenance intervals should reflect the surrounding environment, operating hours and airborne contamination levels.

Temperature-Controlled Cabinet Ventilation

The Finder 7F.21.9.024.1020.0 can be incorporated into a suitable temperature-controlled ventilation system.

A compatible thermostat or controller can switch the fan according to the cabinet's internal temperature.

This allows forced ventilation to operate when required rather than continuously, depending on the application.

The thermostat or switching device must be rated for the fan's DC supply voltage and motor load.

The temperature setpoint should be selected according to the operating limits of the equipment installed inside the enclosure.

Typical Applications

• Industrial electrical control cabinets.
• PLC and automation enclosures.
• Machinery control panels.
• Electrical switchboards.
• Industrial instrumentation cabinets.
• Power supply and relay enclosures.
• OEM machinery and panel manufacturing.
• Building services control cabinets.
• Industrial process control equipment.
• Compact cabinets requiring active air extraction.
• Temperature-controlled electrical enclosure ventilation.
• Industrial installations using a suitable 24 V DC supply.