Why Choose the Finder 7F.21.8.120.4250.0 Reverse Flow Filter Fan?
The Finder 7F.21.8.120.4250.0 is a 120 V AC, Size 4 reverse flow filter fan designed for powered exhaust ventilation in industrial electrical cabinets, automation panels and control enclosures. Part of the Finder Series 7F ventilation range, this model features a distinctive black RAL 9004 housing, high-capacity airflow and replaceable filtration media for reliable enclosure thermal management.
With a nominal free-flow air volume of 250 m³/h at 50 Hz and 295 m³/h at 60 Hz, the Finder 7F.21.8.120.4250.0 is designed to extract warm air from electrical enclosures containing heat-generating equipment. Its reverse airflow arrangement makes it particularly useful for upper cabinet installations, where warm air can be actively expelled while cooler replacement air enters through a suitably positioned ventilation opening.
Operating from a 120 V AC, 50/60 Hz supply, this industrial exhaust fan combines a Size 4 enclosure mounting format, UL Type 12 enclosure suitability and a replaceable filter mat. The black housing provides an alternative to the standard grey version, making it suitable for industrial equipment and electrical panels where a dark enclosure finish is preferred.
Key Advantages
- Reverse flow exhaust operation actively removes warm air from industrial electrical enclosures.
- 250 m³/h free-flow air volume at 50 Hz provides substantial ventilation capacity.
- 295 m³/h free-flow air volume at 60 Hz supports high-capacity enclosure cooling.
- 120 V AC supply suits compatible industrial control and electrical installations.
- Black RAL 9004 housing complements dark-coloured electrical cabinets and machinery.
- Size 4 construction provides a practical enclosure-mounted ventilation solution.
- UL Type 12 enclosure suitability supports appropriate industrial indoor installations.
- Replaceable filter mat simplifies servicing and helps maintain airflow performance.
- Low-noise fan design supports installation in industrial working environments.
- 50,000-hour fan lifetime rating at 40 °C supports long-term ventilation applications.
- Compact construction helps minimise the space required inside electrical cabinets.
- Compatible with appropriately selected Finder Series 7F ventilation accessories.
Key Features
- Finder Series 7F industrial enclosure ventilation system.
- Type 7F.21 reverse flow filter fan.
- Complete model 7F.21.8.120.4250.0.
- Black RAL 9004 housing colour.
- Size 4 filter fan configuration.
- 120 V AC nominal operating voltage.
- 50/60 Hz supply frequency.
- 250 m³/h nominal free-flow air volume at 50 Hz.
- 295 m³/h nominal free-flow air volume at 60 Hz.
- 195 m³/h airflow at 50 Hz with a compatible exhaust filter installed.
- 228 m³/h airflow at 60 Hz with a compatible exhaust filter installed.
- 42 W rated power consumption at 50 Hz.
- 48 W rated power consumption at 60 Hz.
- 56 dB(A) nominal noise level.
- 50,000-hour lifetime rating at 40 °C.
- Reverse airflow for powered extraction of warm cabinet air.
- Replaceable synthetic-fibre filter mat.
- Industrial plastic housing with louvred front cover.
- Size 4 mounting cut-out for compatible electrical enclosures.
- Designed for indoor industrial cabinet ventilation.
Technical Specifications
- Manufacturer: Finder
- Series: 7F
- Type: 7F.21
- Manufacturer part number: 7F.21.8.120.4250.0
- Base model: 7F.21.8.120.4250
- Product type: Reverse flow filter fan
- Ventilation function: Powered exhaust ventilation
- Application: Indoor electrical cabinets and control enclosures
- Housing colour: Black, RAL 9004
- Fan size: Size 4
- Nominal supply voltage: 120 V AC
- Supply frequency: 50/60 Hz
- Free-flow air volume at 50 Hz: 250 m³/h
- Free-flow air volume at 60 Hz: 295 m³/h
- Free-flow air volume at 50 Hz: Approximately 147 CFM
- Free-flow air volume at 60 Hz: Approximately 174 CFM
- Air volume with exhaust filter at 50 Hz: 195 m³/h
- Air volume with exhaust filter at 60 Hz: 228 m³/h
- Rated power consumption at 50 Hz: 42 W
- Rated power consumption at 60 Hz: 48 W
- Noise level: 56 dB(A)
- Fan lifetime at 40 °C: 50,000 hours
- Filter element: Replaceable synthetic-fibre filter mat
- Filter classification: G3 according to EN 779
- Housing material: Industrial plastic
- Housing construction: Louvred filter fan assembly
- Enclosure cut-out: 223 × 223 mm nominal
- Overall dimensions (W × H × D): Approximately 255 × 255 × 104.2 mm
- Mounting: Electrical enclosure panel mounting
- Protection rating: IP54 when correctly installed
- UL enclosure classification: Type 12
- RoHS compliance: Yes
Reliable Reverse Flow Cooling for Industrial Electrical Cabinets
Industrial electrical cabinets frequently contain components that generate heat during normal operation, including power supplies, electronic controllers, motor control equipment and industrial automation devices. The Finder 7F.21.8.120.4250.0 uses powered reverse airflow to extract warm air from the enclosure, helping reduce internal temperature build-up. With a nominal free-flow capacity of up to 295 m³/h at 60 Hz, the fan is suited to ventilation systems where effective heat removal is essential for dependable electrical equipment operation.
The black RAL 9004 enclosure-mounted housing combines an industrial appearance with practical ventilation functionality. A replaceable filter mat helps manage airborne particulate contamination, while the reverse flow configuration allows the fan to be installed where warm air accumulates. For effective cooling, the fan should be matched to the enclosure's heat load, airflow resistance and available ventilation openings. Routine filter maintenance and correct installation are important because actual airflow decreases when filters become obstructed or the enclosure presents additional resistance.
Typical Applications
- Industrial electrical cabinets requiring active exhaust ventilation.
- Black or dark-coloured electrical control enclosures.
- PLC and industrial automation control panels.
- Electrical distribution and switchgear cabinets.
- Industrial machinery and motor control equipment.
- Manufacturing and production line electrical enclosures.
- Power supply and electronic control cabinets.
- Process control and instrumentation equipment.
- OEM machinery requiring filtered forced-air ventilation.
- Industrial enclosure cooling systems using compatible Finder Series 7F components.
