Why Choose the Finder 7F.31.9.024.4250 Outdoor Reverse Flow Filter Fan?
The Finder 7F.31.9.024.4250 is a high-performance 24 V DC outdoor reverse flow filter fan designed to extract warm air from industrial electrical cabinets, automation panels and outdoor control enclosures. Part of the Finder 7F Series, this Size 4 industrial ventilation fan delivers a nominal 250 m³/h free-air airflow and combines powerful exhaust ventilation with robust environmental protection.
Unlike standard intake filter fans, the Finder 7F.31 reverse flow configuration actively extracts air from inside an electrical enclosure and discharges it into the surrounding environment. This makes the fan particularly suitable for outdoor electrical cabinets where heat generated by industrial power supplies, variable frequency drives, transformers, PLCs and communication equipment must be removed efficiently.
Operating from a 24 V DC supply, the Finder 7F.31.9.024.4250 features a 43 W rated power consumption, 1.8 A nominal current draw and 195 m³/h airflow with a corresponding exhaust filter installed. Its IP54 ingress protection, IK08 impact resistance and outdoor-oriented construction make it a practical ventilation solution for demanding industrial environments.
With a 255 × 255 mm front grille, compact installation depth, replaceable filter mat and convenient electrical connections, this Finder outdoor exhaust filter fan offers a combination of airflow performance, environmental durability and straightforward maintenance.
Key Advantages
- Outdoor reverse flow design actively extracts heated air from electrical enclosures.
- 250 m³/h nominal free-air airflow provides substantial ventilation capacity.
- 195 m³/h filtered airflow provides a practical reference for installed ventilation performance.
- 24 V DC operation integrates with compatible industrial automation power systems.
- 43 W rated power consumption supports high-volume forced-air ventilation.
- IP54 ingress protection helps protect against dust and splashing water when correctly installed.
- IK08 impact resistance provides additional mechanical protection.
- Outdoor-oriented construction supports electrical cabinets exposed to changing environmental conditions.
- Size 4 design provides a standardised mounting format for larger enclosures.
- 255 × 255 mm front dimensions suit medium and large industrial cabinets.
- 90.2 mm installation depth helps conserve space inside the enclosure.
- Ball-bearing fan motor supports dependable industrial operation.
- 50,000-hour nominal service life at 40 °C supports maintenance planning.
- Replaceable filter mat simplifies routine servicing.
- Push-in electrical terminals help streamline wiring and commissioning.
- 64 dB(A) specified noise level provides a defined acoustic characteristic.
- Suitable for outdoor automation, power distribution and machinery control enclosures.
Key Features
- Finder 7F Series enclosure ventilation product.
- Type 7F.31 outdoor reverse flow filter fan.
- Exact manufacturer part number: 7F.31.9.024.4250.
- Reverse flow / exhaust airflow direction.
- 24 V DC nominal supply voltage.
- 19.2–26.4 V DC operating voltage range.
- 250 m³/h nominal free-air volume.
- 195 m³/h airflow with corresponding exhaust filter installed.
- 43 W rated power.
- 1.8 A nominal current consumption.
- Size 4 fan and filter assembly.
- 255 × 255 mm front grille dimensions.
- 90.2 mm installation depth.
- IP54 ingress protection.
- IK08 mechanical impact resistance.
- 64 dB(A) acoustic noise level.
- Ball-bearing fan motor.
- 50,000-hour nominal service life at 40 °C.
- Replaceable G3 filter mat.
- Flame-retardant plastic construction.
- UL94 V-0 housing material classification.
- Push-in electrical terminals.
- Designed for outdoor electrical enclosure ventilation.
- CE and UKCA conformity.
- RoHS-compliant construction.
Technical Specifications
- Manufacturer: Finder
- Series: 7F Series
- Model: 7F.31.9.024.4250
- Product type: Outdoor enclosure filter fan
- Fan configuration: Reverse flow / exhaust
- Airflow direction: From inside the electrical enclosure to the outside
- Primary function: Forced-air exhaust ventilation
- Nominal supply voltage: 24 V DC
- Supply type: Direct current
- Operating voltage range: 19.2–26.4 V DC
- Operating voltage tolerance: 0.8–1.1 × nominal voltage
- Nominal current consumption: 1.8 A
- Rated power consumption: 43 W
- Free-air airflow: 250 m³/h
- Airflow with corresponding exhaust filter: 195 m³/h
- Approximate free-air airflow: 147 CFM
- Approximate filtered airflow: 115 CFM
- Fan size: Size 4
- Front grille width: 255 mm
- Front grille height: 255 mm
- Installation depth: 90.2 mm
- Noise level: 64 dB(A)
- Bearing type: Ball bearing
- Nominal fan service life: 50,000 hours at 40 °C
- Ingress protection: IP54
- Mechanical impact resistance: IK08
- Application environment: Outdoor industrial electrical enclosures
- Housing material: Flame-retardant plastic
- Housing flammability classification: UL94 V-0
- Filter arrangement: Integrated replaceable filter mat
- Filter classification: G3 according to EN 779
- Nominal filtration degree: 80–90% under specified test conditions
- Filter material: Synthetic fibre with progressive construction
- Filter temperature resistance: Up to +100 °C
- Filter flame classification: Self-extinguishing, Class F1 according to DIN 53438
- Electrical connection: Push-in terminals
- Conductor cross-section: 0.7–2.5 mm²
- Conductor size: AWG 18–14
- Mounting method: Enclosure panel mounting
- Country of origin: Italy
- Compliance: CE, UKCA and RoHS
- Corresponding outdoor intake version: Finder 7F.30.9.024.4250
- Corresponding indoor reverse flow version: Finder 7F.21.9.024.4250
High-Performance Reverse Flow Ventilation for Outdoor Cabinets
The Finder 7F.31.9.024.4250 is specifically designed to remove warm air from electrical cabinets using a reverse flow ventilation arrangement. This is particularly important in outdoor electrical enclosures containing heat-generating equipment that may be affected by excessive internal temperatures.
During operation, the fan draws air from inside the cabinet and discharges it into the surrounding environment. This helps remove accumulated heat generated by industrial power supplies, transformers, variable frequency drives, contactors, automation controllers and communication equipment.
The 250 m³/h nominal free-air airflow provides substantial ventilation capacity for medium and large outdoor electrical enclosures. Its reverse flow configuration makes it suitable for installations where a powered exhaust outlet is preferred over a conventional filtered intake fan.
For effective operation, the fan should be paired with a suitably positioned filtered air inlet. As warm air is extracted, replacement air enters through the inlet, creating an airflow path through the electrical cabinet.
The inlet and exhaust positions should be selected to encourage airflow across heat-generating components rather than allowing incoming air to travel directly to the exhaust outlet.
Correct ventilation design can help reduce internal temperature build-up and support more stable operating conditions for electrical and electronic equipment.
The Finder 7F.31.9.024.4250 delivers a nominal 250 m³/h free-air airflow, equivalent to approximately 147 CFM. This rating describes fan performance under specified low-resistance conditions.
When used with a corresponding exhaust filter, the specified airflow is approximately 195 m³/h, equivalent to around 115 CFM.
The difference between these figures demonstrates the effect of airflow resistance. Filters, grille openings, cabinet construction and internal obstructions can all reduce the amount of air moving through the complete enclosure.
Electrical cabinet cooling requirements should therefore be calculated using realistic installed airflow rather than relying exclusively on the free-air rating.
Fan selection should also account for the total heat dissipated by the installed equipment, the maximum permissible internal temperature and the surrounding ambient conditions.
Forced-air ventilation cannot cool an electrical cabinet below the temperature of the incoming ambient air. Where the ambient temperature is too high, or where environmental contamination makes open ventilation unsuitable, an enclosure air conditioner or another cooling system may be required.
IP54 and IK08 Protection for Outdoor Industrial Enclosures
The Finder 7F.31.9.024.4250 is designed for outdoor electrical cabinet ventilation and incorporates protection characteristics intended for demanding industrial environments.
Its IP54 ingress protection rating provides protection against harmful dust ingress and splashing water when the fan is correctly installed.
The IK08 mechanical impact resistance rating provides additional protection against accidental impacts during installation, maintenance and normal industrial operation.
The outdoor-oriented construction supports applications where the electrical enclosure may be exposed to changing weather conditions. However, the complete enclosure must still be designed and installed to provide the environmental protection required by the application.
Correct installation orientation, suitable panel openings, appropriate seals and regular filter maintenance are important for maintaining the intended protection.
For particularly aggressive environments, including corrosive atmospheres, marine installations or high-pressure washdown areas, the suitability of the complete ventilation system should be assessed separately.
24 V DC Operation for Industrial Automation Systems
The Finder 7F.31.9.024.4250 operates from a nominal 24 V DC supply, making it suitable for industrial control panels that already use low-voltage DC power distribution.
Its specified operating voltage range is 19.2–26.4 V DC, corresponding to 80–110% of the nominal supply voltage.
With a 43 W rated power consumption and 1.8 A nominal current draw, the fan should be included in the electrical cabinet's DC power budget.
The power supply must be capable of delivering the required current while maintaining the correct voltage under operating conditions.
The fan can also be incorporated into a temperature-controlled ventilation arrangement using a suitably rated thermostat, controller or switching device.
For example, a cabinet thermostat can energise the fan when the internal temperature rises above a selected threshold. This allows ventilation to operate according to the thermal requirements of the enclosure.
The Finder 7F.31.9.024.4250 is a DC-powered fan. It must not be connected directly to a 120 V AC or 230 V AC supply.
Replaceable G3 Filter Mat and Straightforward Maintenance
The Finder 7F.31.9.024.4250 incorporates a replaceable G3 filter mat designed to help manage airborne contaminants in the ventilation path.
The filter uses progressive synthetic fibre construction with a specified filtration degree of approximately 80–90% under the manufacturer's test conditions.
The filter material is temperature-resistant up to +100 °C and is classified as self-extinguishing according to Class F1 of DIN 53438.
During operation, airborne dust and particles can accumulate in the filter. As contamination increases, airflow resistance may rise and ventilation performance can decrease.
Regular inspection and replacement of the filter mat are therefore important for maintaining effective enclosure cooling.
The appropriate maintenance interval depends on the surrounding environment, dust concentration and operating conditions.
Replacement filter media should be selected according to Finder's current Size 4 accessory documentation to maintain the intended fit, filtration characteristics and environmental protection.
Size 4 Enclosure Installation and Push-In Electrical Connections
The Finder 7F.31.9.024.4250 uses a Size 4 mounting format with a front grille measuring approximately 255 × 255 mm.
The fan has an installation depth of approximately 90.2 mm, helping conserve space inside the electrical enclosure.
Before preparing the cabinet opening, installers should consult the current Finder dimensional drawing for the exact cut-out dimensions, permitted panel thickness and installation tolerances.
The fan is designed for installation into a suitable enclosure panel and should be positioned to provide an effective exhaust airflow path.
Electrical connection is provided through push-in terminals, suitable for conductor cross-sections from 0.7 to 2.5 mm² (AWG 18–14).
The 24 V DC supply must be connected using appropriately rated wiring and protective devices in accordance with the manufacturer's instructions.
For outdoor installations, the overall cabinet design must also consider water drainage, condensation, cable entry protection and the environmental ratings of all installed components.
Long Service Life and Dependable Industrial Performance
The Finder 7F.31.9.024.4250 features a ball-bearing fan motor designed for dependable industrial operation.
Its nominal service life of 50,000 hours at 40 °C provides a useful reference for maintenance planning, although actual service life will depend on operating conditions, ambient temperature and environmental exposure.
The fan has a specified acoustic noise level of 64 dB(A), which should be considered when designing electrical cabinets installed near occupied working areas.
Its combination of high-volume airflow, low-voltage DC operation, outdoor protection and serviceable filtration makes it suitable for industrial applications where reliable cabinet ventilation is required.
Typical Applications
- Outdoor electrical cabinet exhaust ventilation.
- Industrial automation control panels installed outdoors.
- 24 V DC industrial control system enclosures.
- PLC and remote I/O cabinets.
- Outdoor variable frequency drive and motor control enclosures.
- Industrial communication and networking cabinets.
- Remote monitoring and telemetry equipment.
- Outdoor electrical distribution panels.
- Renewable energy control and monitoring enclosures.
- Water treatment and pumping station control cabinets.
- Industrial instrumentation enclosures.
- Roadside and infrastructure automation cabinets.
- Outdoor machinery electrical panels.
- Industrial OEM electrical cabinet manufacturing.
- Electrical enclosure refurbishment and maintenance.
- Applications requiring IP54 and IK08 protection.
- Medium and large outdoor enclosures requiring powered exhaust ventilation.
