Why Choose the Finder 7F.21.8.120.4250 Reverse Flow Filter Fan?
The Finder 7F.21.8.120.4250 is a high-performance 120 V AC reverse flow filter fan designed for extracting warm air from industrial electrical cabinets, automation panels and control enclosures. Part of the Finder Series 7F ventilation range, this Size 4 exhaust fan combines powered airflow, integrated filtration and compact enclosure mounting to support effective thermal management of industrial electrical equipment.
Featuring 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 provides substantial ventilation capacity for electrical cabinets containing heat-generating components. Its reverse airflow configuration draws warm air from inside the enclosure and expels it through the filtered fan assembly, making it particularly suitable for applications requiring active exhaust ventilation.
The fan operates from a 120 V AC, 50/60 Hz supply and features a Size 4 housing measuring 255 × 255 mm, an easily replaceable G3 filter mat and an IP54 protection rating when correctly installed. With a low-noise design, flame-retardant housing and convenient enclosure mounting arrangement, it provides a practical ventilation solution for industrial machinery, electrical distribution equipment and automation systems.
Key Advantages
- Reverse flow exhaust operation actively removes warm air from industrial electrical enclosures.
- 250/295 m³/h free-flow air volume at 50/60 Hz supports effective cabinet ventilation.
- 120 V AC nominal supply for compatible industrial electrical installations.
- Size 4 construction provides substantial ventilation capacity in a compact enclosure-mounted assembly.
- IP54 protection rating helps protect the enclosure against dust and water ingress when correctly installed.
- G3 synthetic-fibre filter mat helps reduce airborne particulate contamination.
- Replaceable filter element simplifies maintenance and supports consistent airflow.
- Low-noise operation at 56 dB(A) supports industrial working environments.
- 50,000-hour fan lifetime rating at 40 °C supports long-term ventilation requirements.
- Flame-retardant plastic housing provides robust construction for industrial electrical cabinets.
- Snap-in enclosure mounting helps reduce installation time.
- Compatible with appropriately sized Finder Series 7F passive ventilation components.
Key Features
- Finder Series 7F industrial filter fan.
- Type 7F.21 reverse flow filter fan configuration.
- Size 4 enclosure ventilation assembly.
- 120 V AC nominal operating voltage.
- 50/60 Hz supply frequency.
- 250 m³/h free-flow air volume at 50 Hz.
- 295 m³/h 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) noise level.
- 50,000-hour lifetime rating at 40 °C.
- G3 filtration classification according to EN 779.
- Replaceable synthetic-fibre filter mat with progressive construction.
- Self-extinguishing plastic housing meeting UL94 V-0.
- IP54 protection according to EN 60529.
- NEMA Type 12 enclosure protection classification.
- Push-in electrical terminals for convenient wiring.
- Compact enclosure-mounted design with minimal internal installation depth.
- Designed for indoor industrial electrical cabinet applications.
Technical Specifications
- Manufacturer: Finder
- Series: 7F
- Type: 7F.21
- Manufacturer part number: 7F.21.8.120.4250
- Product type: Reverse flow filter fan
- Ventilation function: Powered exhaust ventilation
- Installation environment: Indoor electrical enclosures
- Fan size: Size 4
- Nominal supply voltage: 120 V AC
- Supply frequency: 50/60 Hz
- Operating voltage range: 96–132 V AC
- Free-flow air volume at 50 Hz: 250 m³/h
- Free-flow air volume at 60 Hz: 295 m³/h
- 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
- Current consumption at 50 Hz: 0.35 A
- Current consumption at 60 Hz: 0.40 A
- Noise level: 56 dB(A)
- Fan lifetime at 40 °C: 50,000 hours
- Filter classification: G3 according to EN 779
- Filter efficiency: 80–90% under the referenced G3 classification
- Filter material: Synthetic fibre with progressive construction
- Filter material temperature resistance: Up to +100 °C
- Filter material flammability: Class F1 according to DIN 53438
- Housing material: Self-extinguishing plastic
- Housing flammability classification: UL94 V-0
- Housing colour: Grey, RAL 7035
- Overall dimensions (W × H × D): 255 × 255 × 104.2 mm
- Enclosure cut-out: 223 × 223 mm nominal
- Mounting: Snap-in enclosure mounting
- Electrical connections: Push-in terminals
- Conductor cross-section: 0.7–2.5 mm²
- Ambient operating temperature: −15 to +55 °C
- Protection rating: IP54 according to EN 60529
- NEMA enclosure rating: Type 12
- Compatible exhaust filter: Finder 7F.02.0.000.4000
- Replacement filter mat: Finder 07F.45
- Approvals: CE, CSA, cULus, cURus and EAC, according to applicable certification
- RoHS compliance: Yes
Reliable Reverse Flow Cooling for Industrial Electrical Enclosures
Electrical control cabinets often contain heat-generating equipment such as power supplies, contactors, motor control devices and electronic controllers. Without adequate ventilation, internal temperatures can rise and adversely affect component performance. The Finder 7F.21.8.120.4250 addresses this requirement through powered reverse flow ventilation, drawing warm air from inside the cabinet and discharging it through the fan assembly. With a free-flow capacity of up to 295 m³/h at 60 Hz, it can support effective heat removal when correctly selected for the enclosure and its thermal load.
The fan incorporates a G3 replaceable synthetic-fibre filter mat and a protective enclosure-mounted housing to help reduce particulate contamination. Its IP54 protection, low-noise construction and 50,000-hour lifetime rating at 40 °C make it suitable for demanding industrial control applications. Actual airflow depends on the selected ventilation arrangement, filter condition, enclosure resistance and installation environment. Routine filter maintenance and correct fan sizing are important for maintaining reliable cooling performance.
Typical Applications
- Industrial electrical control cabinets requiring active exhaust ventilation.
- PLC and automation control panels.
- Electrical distribution and switchgear enclosures.
- Industrial machinery and motor control cabinets.
- Manufacturing and production line electrical equipment.
- Power supply and electronic control enclosures.
- Process control and industrial instrumentation cabinets.
- Packaging and automated handling machinery.
- OEM electrical equipment requiring filtered forced-air cooling.
- Industrial enclosure ventilation systems using compatible Finder Series 7F components.
