Why Choose the Finder 7F.21.8.120.5550 Reverse-Flow Filter Fan?
The Finder 7F.21.8.120.5550 is a high-capacity 120 V AC reverse-flow filter fan designed for effective ventilation and temperature management in industrial electrical enclosures. Part of the Finder 7F Series, this Size 5 unit provides a nominal free-air flow rate of 550 m³/h, making it suitable for electrical cabinets containing heat-generating automation and control equipment.
Unlike the standard airflow configuration, the 7F.21 reverse-flow design uses a blowing airflow arrangement, allowing engineers to select the appropriate ventilation direction for their enclosure. The integrated filter helps limit airborne dust entering the cabinet while the fan supports the exchange of warm internal air with cooler ambient air.
Featuring a 75 W rated power consumption, IP54 protection rating and a 320 × 320 mm external frame, the Finder 7F.21.8.120.5550 combines substantial ventilation capacity with practical enclosure installation. Its snap-in mounting system and replaceable filter arrangement make it suitable for industrial control panel construction and maintenance.
Key Advantages
- 550 m³/h nominal free-air flow for high-capacity electrical cabinet ventilation.
- 120 V AC operating voltage for compatible industrial electrical installations.
- Reverse-flow blowing configuration for applications requiring the alternative airflow direction.
- 75 W rated power consumption for powered enclosure ventilation.
- IP54 protection rating to help protect the enclosure against dust and water ingress when correctly installed.
- Integrated air filtration helps reduce the entry of airborne contaminants.
- Size 5 construction suitable for larger electrical cabinet ventilation requirements.
- Snap-in mounting simplifies installation into a prepared enclosure cut-out.
- Replaceable filter media supports routine maintenance.
- Suitable for industrial automation, electrical distribution and machinery control enclosures.
Key Features
- Finder 7F Series reverse-flow filter fan.
- Size 5 fan and filter assembly.
- 550 m³/h nominal airflow under free-air conditions.
- 120 V AC nominal operating voltage.
- 50/60 Hz AC supply compatibility.
- 75 W rated power consumption.
- 660 mA operating current.
- Reverse-flow blowing arrangement.
- Integrated fan, filter and protective cover.
- IP54 enclosure protection when installed as specified.
- 320 × 320 mm external frame.
- 291 × 291 mm mounting cut-out.
- 131.5 mm overall depth.
- RAL 7035 grey finish.
- Snap-in enclosure mounting.
- Compatible Size 5 replacement filter and exhaust-filter arrangements.
Technical Specifications
- Manufacturer: Finder
- Series: 7F Series
- Model: 7F.21.8.120.5550
- Product type: Reverse-flow filter fan
- Fan size: Size 5
- Nominal operating voltage: 120 V AC
- Supply frequency: 50/60 Hz
- Nominal free-air flow: 550 m³/h
- Rated power consumption: 75 W
- Operating current: 660 mA
- Airflow direction: Reverse flow / blowing
- Number of fans: 1
- Filter: Integrated replaceable filter
- Protective cover: Included
- Protection rating: IP54
- NEMA protection classification: Type 3
- External dimensions (H × W × D): 320 × 320 × 131.5 mm
- Required mounting cut-out: 291 × 291 mm
- Mounting method: Snap-in enclosure mounting
- Colour: Grey, RAL 7035
- Operating ambient temperature: −15 to +55 °C
- Compatible Size 5 exhaust filter: Finder 7F.02.0.000.5000
- Application: Industrial electrical enclosure ventilation
High-Capacity Cooling for Industrial Electrical Cabinets
Industrial control panels frequently contain equipment such as PLCs, contactors, variable speed drives, power supplies and electronic controllers that generate heat during operation. The Finder 7F.21.8.120.5550 helps manage this heat by providing forced airflow through the enclosure, reducing the build-up of warm air around installed electrical components.
Its reverse-flow configuration allows the fan to introduce filtered air into the cabinet rather than using the standard extraction arrangement. This makes it useful where the enclosure design requires a specific airflow direction. A correctly positioned exhaust filter allows the incoming air to circulate through the cabinet and carry heat away from electrical equipment.
The nominal 550 m³/h airflow is measured under free-air conditions. Actual ventilation performance depends on the installed filter, exhaust opening, enclosure resistance and operating environment. Engineers should therefore consider the cabinet heat load, ambient temperature and system pressure losses when sizing the ventilation arrangement.
The fan's replaceable filter media should be inspected and maintained regularly, particularly in dusty industrial environments. Suitable maintenance helps preserve airflow and supports dependable operation of the enclosure cooling system.
Typical Applications
- Industrial electrical control cabinet cooling.
- PLC and automation equipment enclosures.
- Motor control centres and machinery panels.
- Variable speed drive and softstarter cabinets.
- Electrical distribution and switchgear enclosures.
- Industrial power supply and relay cabinets.
- Manufacturing and production machinery.
- Packaging and material handling systems.
- OEM control panel construction.
- Large electrical cabinets requiring reverse-flow ventilation.
- Industrial enclosure cooling upgrades.
- Replacement of compatible Size 5 filter fan assemblies.
