Why Choose the Finder 7F.21.8.120.1020 Reverse Flow Filter Fan?
The Finder 7F.21.8.120.1020 is a compact 120 V AC reverse flow filter fan designed for effective ventilation and heat management in electrical enclosures, industrial control cabinets and automation panels. Part of the Finder Series 7F, this Size 1 fan provides a nominal free-air flow of 24 m³/h (approximately 14.13 CFM) in a space-saving enclosure-mounted design.
Unlike a conventional intake filter fan, the Finder 7F.21.8.120.1020 uses a reverse airflow configuration to extract warm air from an enclosure. This makes it particularly useful where the ventilation design requires heated internal air to be discharged through a dedicated exhaust fan rather than relying solely on passive ventilation.
Designed for installation in enclosure sidewalls, this model uses a Size 1 mounting cut-out of 92 × 92 mm, with the manufacturer's specified installation tolerance. Its compact format makes it suitable for smaller electrical cabinets where internal space is limited but controlled airflow remains important.
With its 120 V AC, 50/60 Hz supply, reverse flow operation and enclosure ventilation design, the Finder 7F.21.8.120.1020 provides a practical solution for managing heat generated by electronic components, relays, power supplies and other equipment installed inside industrial control panels.
Key Advantages
- Reverse flow ventilation designed to extract warm air from electrical enclosures.
- 24 m³/h nominal free-air flow for compact cabinet ventilation applications.
- Approximately 14.13 CFM airflow for convenient comparison with other fan specifications.
- 120 V AC operation for compatible electrical supply systems.
- 50/60 Hz AC supply compatibility.
- Size 1 compact design for smaller electrical enclosures.
- 92 × 92 mm nominal enclosure cut-out for straightforward installation planning.
- Sidewall mounting configuration for integration into suitable control cabinets.
- Active warm-air extraction to support enclosure temperature management.
- Filter fan construction for use in appropriately designed ventilation systems.
- Space-saving square format for compact electrical installations.
- Compatible with thermostat-controlled ventilation when used with a suitably rated controller.
- Suitable for continuous cabinet ventilation within the manufacturer's operating limits.
- Helps reduce heat accumulation when correctly sized for the enclosure and its thermal load.
- Finder Series 7F construction for industrial enclosure ventilation applications.
- Suitable for automation panels, machine control cabinets, electrical distribution enclosures and OEM equipment.
Key Features
- Finder Series 7F filter fan.
- Product type: Reverse flow / exhaust filter fan.
- Fan configuration: Enclosure-mounted AC fan.
- Airflow direction: Reverse flow, for air extraction.
- Nominal free-air flow: 24 m³/h.
- Nominal airflow in imperial units: Approximately 14.13 CFM.
- Nominal supply voltage: 120 V AC.
- Supply frequency: 50/60 Hz.
- Fan size: Size 1.
- Enclosure cut-out: 92 × 92 mm nominal.
- Cut-out tolerance: +1.0 mm, as specified by Finder.
- Mounting location: Enclosure sidewall.
- Housing format: Compact square filter fan assembly.
- Primary function: Forced ventilation and warm-air extraction.
- Application: Indoor electrical enclosure ventilation.
- Manufacturer: Finder.
Technical Specifications
- Manufacturer: Finder
- Series: 7F
- Manufacturer part number: 7F.21.8.120.1020
- Product type: Reverse flow filter fan
- Alternative description: Exhaust filter fan
- Fan technology: AC-powered enclosure ventilation fan
- Airflow configuration: Reverse flow
- Airflow function: Extraction of air from an electrical enclosure
- Nominal voltage: 120 V AC
- Nominal frequency: 50/60 Hz
- Nominal free-air flow: 24 m³/h
- Nominal free-air flow: Approximately 14.13 CFM
- Size designation: Size 1
- Required enclosure cut-out: 92 × 92 mm, +1.0 mm tolerance
- Installation type: Enclosure sidewall mounting
- Intended environment: Indoor electrical enclosures
- Housing format: Square filter fan assembly
- Primary application: Electrical cabinet ventilation and heat extraction
- Product family: Finder Series 7F filter fans and enclosure ventilation accessories
- EAN / GTIN: 8012823427461
Reverse Flow Ventilation for Electrical Control Cabinets
The Finder 7F.21.8.120.1020 is specifically designed for applications requiring forced air extraction from an electrical enclosure. Its reverse flow arrangement distinguishes it from the standard Finder 7F.20 intake filter fan range.
Electrical cabinets often contain equipment that generates heat during operation. Power supplies, variable speed drives, transformers, contactors and electronic control devices can raise the internal temperature of an enclosure, particularly when equipment is installed in a compact space.
Excessive heat can reduce the operating margin of electronic components and contribute to premature equipment ageing. A correctly designed ventilation system helps remove accumulated warm air and replace it with cooler air from the surrounding environment.
With a nominal free-air flow of 24 m³/h, the Finder 7F.21.8.120.1020 provides an active extraction solution for smaller enclosures. Actual airflow depends on the resistance created by filters, grilles, enclosure openings and the overall ventilation arrangement.
For best results, the exhaust fan should be installed as part of a coordinated airflow system, with a suitably positioned inlet that allows replacement air to enter the cabinet. This helps create an effective airflow path across heat-generating equipment.
Compact Size 1 Design for Space-Constrained Installations
The Finder 7F.21.8.120.1020 uses the Size 1 enclosure mounting format, making it suitable for compact control panels and electrical cabinets.
Its specified 92 × 92 mm mounting cut-out allows engineers and panel builders to plan the enclosure opening before installation. The cut-out dimensions must be checked against the manufacturer's current installation drawing, including the specified tolerance.
Sidewall mounting is particularly convenient for industrial cabinets where the ventilation equipment must be installed without occupying significant internal DIN rail space.
The square fan format also supports straightforward integration into new enclosure designs and replacement applications where the existing opening is compatible with Finder's Size 1 arrangement.
Before replacing an existing fan, installers should verify the supply voltage, airflow direction, cut-out dimensions and overall mounting requirements. An intake fan and an exhaust fan are not automatically interchangeable simply because they share the same physical size.
Supporting Reliable Enclosure Temperature Management
Effective enclosure ventilation helps maintain suitable operating temperatures for industrial control equipment. The Finder 7F.21.8.120.1020 can form part of a ventilation system designed to remove excess heat from a cabinet.
The required ventilation capacity depends on several factors, including the total heat generated by the installed equipment, enclosure dimensions, surrounding ambient temperature and permissible internal temperature rise.
The fan's 24 m³/h free-air rating represents airflow under the manufacturer's nominal measurement conditions. In an installed enclosure, airflow will generally be lower because of restrictions created by filters, inlet openings and other components.
For temperature-controlled operation, the fan may be connected through a compatible enclosure thermostat or ventilation controller. This allows the fan to operate when cooling is required rather than running unnecessarily at all times.
Where the ambient air temperature is higher than the desired internal enclosure temperature, ventilation alone cannot provide cooling below ambient. In those conditions, a suitable enclosure cooling system may be required.
Installation and Electrical Compatibility
The Finder 7F.21.8.120.1020 is intended for mounting into a suitable opening in an electrical enclosure sidewall. The nominal Size 1 cut-out is 92 × 92 mm, subject to the manufacturer's specified tolerance and installation instructions.
The fan requires a compatible 120 V AC, 50/60 Hz electrical supply. It must not be connected directly to a 230 V AC supply unless an appropriate and correctly rated voltage conversion arrangement is provided.
For installations in the United Kingdom, where 230 V AC mains supplies are common, checking the fan voltage is particularly important. Finder offers other Series 7F variants with different supply voltage ratings, so the correct model should be selected for the electrical installation.
The fan should be positioned to promote an effective path for airflow through the enclosure. The location of air inlets, exhaust outlets and internal components should be considered to avoid obstructed ventilation or recirculation of discharged warm air.
Electrical installation should be completed by suitably qualified personnel. Suitable upstream protection and isolation arrangements must be provided according to the applicable standards and the manufacturer's instructions.
Where filtration is required, the filter media should be inspected and maintained regularly. Dust accumulation can restrict airflow and reduce ventilation effectiveness.
Typical Applications
- Industrial electrical cabinet exhaust ventilation.
- PLC and automation control panel cooling.
- Machine control enclosure ventilation.
- Electrical distribution cabinet heat extraction.
- OEM equipment enclosure ventilation.
- Industrial relay and contactor cabinets.
- Power supply and electronic equipment enclosures.
- Small industrial control panels.
- Factory automation equipment.
- Building management control cabinets.
- Industrial monitoring and instrumentation enclosures.
- Thermostat-controlled enclosure ventilation systems.
- Replacement exhaust fan installations with compatible dimensions and voltage.
- Equipment cabinets requiring a compact 120 V AC extraction fan.
