Finder 7F.21.9.024.1020 – 24 V DC Reverse-Flow Exhaust Filter Fan, Size 1, 24 m³/h, IP54
The Finder 7F.21.9.024.1020 is a compact 24 V DC reverse-flow exhaust filter fan designed for ventilation and thermal management in electrical enclosures, industrial control cabinets and switchboards. Part of the Finder 7F Series, this Size 1 fan actively extracts warm air from an enclosure to help maintain suitable operating temperatures for electrical and electronic equipment.
Featuring a 24 V DC operating supply, 24 m³/h nominal free-air volume and a low 3.6 W power rating, the Finder 7F.21.9.024.1020 is particularly suitable for compact industrial cabinets where space, power consumption and ventilation performance are important.
The fan has a 120 × 120 mm front housing, an approximate 50.4 mm depth and an IP54 protection rating when correctly installed. Its replaceable filter mat supports routine maintenance, while its reverse-flow configuration provides active exhaust ventilation rather than the intake airflow associated with standard filter fans.
Designed for use in compatible 24 V DC control systems, the Finder 7F.21.9.024.1020 is a practical solution for control panel manufacturers, machine builders, electrical engineers and industrial maintenance teams.
Key Advantages
- Reverse-flow exhaust operation actively removes warm air from electrical cabinets.
- 24 V DC supply is suitable for compatible industrial low-voltage control systems.
- 24 m³/h free-air volume provides ventilation for appropriately sized enclosures.
- Low 3.6 W power consumption helps minimise the electrical demand of cabinet ventilation.
- Compact Size 1 housing suits installations with limited panel space.
- 120 × 120 mm front dimensions provide a space-efficient enclosure ventilation solution.
- IP54 protection helps limit harmful dust ingress and splashing water when correctly installed.
- Replaceable filter mat supports straightforward inspection and maintenance.
- Low-noise operation makes it suitable for a range of industrial environments.
- Snap-in mounting supports convenient installation in compatible enclosure panels.
- Thermostat-compatible operation allows ventilation to be controlled according to cabinet temperature.
- Finder 7F Series compatibility supports coordinated enclosure ventilation designs.
Key Features
- Finder 7F Series enclosure ventilation fan.
- Type 7F.21 reverse-flow exhaust configuration.
- Size 1 filter fan assembly.
- 24 V DC nominal supply voltage.
- 24 m³/h nominal free-air volume.
- Approximately 14.13 CFM airflow.
- 3.6 W rated power consumption.
- IP54 ingress protection rating.
- NEMA Type 12 classification.
- 120 × 120 mm front housing.
- Approximately 50.4 mm overall depth.
- Approximately 37.5 dB(A) noise emission.
- Integrated DC fan motor.
- Replaceable synthetic fibre filter mat.
- Compatible with Finder 07F.15 Size 1 replacement filter mats.
- Suitable for enclosure wall or panel mounting.
- Snap-in installation arrangement.
- Designed for electrical cabinet cooling and air extraction.
Technical Specifications
- Manufacturer: Finder
- Series: 7F Series
- Type: 7F.21
- Manufacturer part number: 7F.21.9.024.1020
- Product type: Reverse-flow exhaust filter fan
- Product category: Electrical enclosure thermal management
- Airflow direction: Exhaust / reverse flow
- 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
- Free-air volume in imperial units: Approximately 14.13 CFM
- Front housing width: 120 mm
- Front housing height: 120 mm
- Overall depth: Approximately 50.4 mm
- Nominal panel cut-out: 92 × 92 mm
- Housing colour: Grey
- Ingress protection: IP54
- North American enclosure classification: NEMA Type 12
- Noise emission: Approximately 37.5 dB(A)
- Fan motor: Integrated DC motor
- Filter element: Replaceable
- Compatible replacement filter mat: Finder 07F.15
- Corresponding Size 1 exhaust filter: Finder 7F.02.0.000.1000
- Mounting: Snap-in enclosure panel mounting
- RoHS status: RoHS3 compliant
- EAN: 8012823425702
How the Finder 7F.21 Reverse-Flow Filter Fan Works
The Finder 7F.21.9.024.1020 uses an integrated DC fan motor to extract warm air from inside an electrical enclosure.
During normal operation, electrical components such as power supplies, controllers, contactors and interface modules generate heat. Without adequate ventilation, this heat can accumulate and raise the internal cabinet temperature.
The reverse-flow fan draws air from inside the enclosure and expels it through the fan opening. Replacement air enters through a suitable inlet, establishing an airflow path through the cabinet.
This process helps remove accumulated heat and supports more suitable operating conditions for temperature-sensitive electrical and electronic components.
The fan has a nominal 24 m³/h free-air volume. Actual installed airflow will depend on the resistance of the filter, inlet arrangement, cabinet geometry and other ventilation components.
Reverse-Flow Exhaust Versus Standard Intake Filter Fans
The primary distinction between the Finder 7F.21 and Finder 7F.20 ranges is the direction of airflow.
A standard 7F.20 filter fan is generally used to introduce external air into an enclosure. The air then circulates through the cabinet before leaving through an exhaust opening.
The Finder 7F.21.9.024.1020 instead provides active exhaust ventilation, removing air from inside the cabinet.
This can be useful where the enclosure layout requires a powered outlet or where the thermal management design specifies air extraction.
The choice between intake and exhaust ventilation should consider the complete installation, including the required airflow path, ambient dust levels, inlet filtration and internal heat load.
24 V DC Operation with Low Power Consumption
The Finder 7F.21.9.024.1020 operates from a nominal 24 V DC supply, making it suitable for many industrial control systems that already use regulated low-voltage DC power.
Its 3.6 W rated power consumption allows the fan to provide active ventilation with a relatively low electrical demand.
The fan can be incorporated into a temperature-controlled ventilation arrangement using a suitable thermostat or switching device rated for the DC motor load.
Before installation, the available power supply capacity, wiring, polarity and protective arrangements should be checked against the manufacturer's instructions.
Important: This is a 24 V DC fan. It must not be connected directly to a 120 V AC or 230 V AC supply.
IP54 Protection for Electrical Enclosures
The Finder 7F.21.9.024.1020 has an IP54 ingress protection rating when correctly installed.
IP54 indicates protection against harmful dust ingress and splashing water under the applicable test conditions.
The fan housing and filter assembly support ventilation while helping maintain the environmental protection required for suitable industrial electrical enclosures.
The unit is also listed with a NEMA Type 12 classification, making it suitable for appropriately designed indoor industrial cabinet installations.
The protection rating of the completed enclosure depends on correct installation, panel sealing and the ratings of all other fitted components.
Compact Size 1 Panel Installation
The Finder 7F.21.9.024.1020 features a compact 120 × 120 mm front housing and an approximate 50.4 mm depth.
The Size 1 format uses a nominal 92 × 92 mm panel cut-out, allowing the fan to be incorporated into suitable electrical enclosure walls.
Its snap-in mounting arrangement supports convenient installation and helps reduce the time required for cabinet assembly.
The fan should be positioned to establish an effective airflow path through the enclosure, with particular attention to the location of heat-generating components.
The exact mounting clearances, panel thickness requirements and connection details should be confirmed using Finder's installation documentation.
Replaceable Filter Mat and Maintenance
The Finder 7F.21.9.024.1020 includes a replaceable filter element that can be inspected and renewed as part of routine enclosure maintenance.
Dust accumulation can increase airflow resistance and reduce the effectiveness of the ventilation system.
The compatible Finder 07F.15 Size 1 replacement filter mat allows maintenance personnel to replace the filter material without changing the complete fan assembly.
Inspection intervals should reflect the operating environment. Cabinets installed in dusty manufacturing areas may require more frequent maintenance than those located in clean electrical rooms.
Regular filter inspection helps preserve airflow and supports dependable enclosure cooling.
Thermal Management for Industrial Control Cabinets
Electrical enclosures frequently contain components that generate heat during operation, including PLCs, power supplies, contactors, relays, transformers and electronic control modules.
Excessive internal temperatures can reduce equipment reliability and may shorten the service life of temperature-sensitive components.
The Finder 7F.21.9.024.1020 helps manage cabinet temperatures by actively removing warm air.
Its compact dimensions and low power consumption make it particularly suitable for smaller electrical enclosures requiring moderate forced ventilation.
The fan should be selected according to the enclosure's total heat dissipation, the surrounding ambient temperature and the actual airflow resistance of the installation.
Typical Applications
- Industrial electrical control cabinets.
- PLC and automation enclosures.
- Machinery control panel ventilation.
- Electrical switchboards.
- Industrial instrumentation cabinets.
- Low-voltage DC control systems.
- Power supply and relay enclosures.
- OEM machinery and electrical panel manufacturing.
- Building services control cabinets.
- Industrial process control equipment.
- Compact enclosures requiring active exhaust ventilation.
- Thermostat-controlled cabinet cooling systems.
- Electrical installations using a suitable 24 V DC supply.
