Description
The Rittal SK 3244.140 (also known as SK3244140) is a high-capacity TopTherm wall-mounted filter fan unit engineered with an integrated three-phase diagonal motor to provide pressure-resistant, uniform heat evacuation across industrial electrical enclosures. Operating on 400 V / 460 V AC (3-phase, 50/60 Hz), the unit delivers an unimpeded airflow of 412 CFM (700 m³/h) at 50 Hz and 453.2 CFM (770 m³/h) at 60 Hz using the factory-installed chopped-fiber filter mat, reaching up to 532.66 CFM (905 m³/h) with an optional pleated filter. Housed in robust RAL 7035 light-gray thermoplastic measuring 323 x 323 mm (12.7 x 12.7 in) with an installation depth of 130.5 mm (5.14 in), it fits standard 292 x 292 mm cutouts with tool-free snap-in mounting. Built for industrial reliability, this assembly features tool-free spring-loaded terminals, an IP54 / NEMA 12 protection rating, and an extended L10 operating life of up to 66,000 hours.
Key Features
- Diagonal Airflow Geometry: Delivers superior aerodynamic pressure resistance and uniform enclosure heat dissipation compared to traditional axial fans.
- Dual-Frequency Three-Phase Drive: Operates efficiently across 400V/460V three-phase grids at 93W (50 Hz) and 140W (60 Hz).
- Tool-Free Enclosure Mounting: Engineered with quick-release snap-fit latches fitting standard 292 x 292 mm cabinet cutouts without hardware.
- Comprehensive Ingress Protection: Standard IP54 and NEMA 12 protection expandable to IP56 and NEMA 4X with hoods.
- Vibration-Proof Spring Terminals: Features screwless spring-clamp electrical terminals ensuring gas-tight wiring connections resistant to machinery vibration.
- Extended Bearing Endurance: Delivers an L10 service life rating of 66,000 operating hours at 40°C ambient temperatures.
Technical Specifications
| Manufacturer | Rittal |
|---|---|
| Manufacturer Part Number (MPN) | SK 3244.140 |
| Alternate Part Number | SK3244140 |
| Product Series | TopTherm Filter Fan Units |
| Product Category | Filter Fans |
| Fan / Component Type | Wall-Mounted Enclosure Filter Fan Unit |
| Fan Motor Technology | Diagonal fan with three-phase motor |
| Phase & Supply Type | 3-Phase AC |
| Rated Operating Voltage | 400 V (3~, 50/60 Hz) / 460 V (3~, 60 Hz) |
| Frequency | 50 / 60 Hz |
| Rated Power Pel | 93 W (50 Hz) / 140 W (60 Hz) |
| Rated Current Max. | 0.17 A (50 Hz) / 0.21 A (60 Hz) |
| Unimpeded Air Flow (Chopped Fiber Filter) | 412.0 CFM (700 m³/h) at 50 Hz / 453.2 CFM (770 m³/h) at 60 Hz |
| Air Throughput with 1x 3243.200 Outlet Filter | 285.5 CFM (485 m³/h) at 50 Hz / 306.1 CFM (520 m³/h) at 60 Hz |
| Air Throughput with 2x 3243.200 Outlet Filters | 335.5 CFM (570 m³/h) at 50 Hz / 370.8 CFM (630 m³/h) at 60 Hz |
| Noise Pressure Level | 67 dB(A) at 50 Hz / 70 dB(A) at 60 Hz |
| Housing Dimensions (W x H) | 323 x 323 mm (12.7 x 12.7 in) |
| External Build Depth (Protrusion) | 25 mm (0.98 in) |
| Installation Depth | 130.5 mm (5.14 in) |
| Mounting Cutout Size (W x H) | 292 x 292 mm (11.5 x 11.5 in) |
| Housing Color | RAL 7035 (Light Gray) |
| Standard Filter Media Included | Chopped-fiber synthetic filter mat |
| Electrical Termination | Spring-loaded screwless connection terminal |
| Mounting Method | Tool-free snap-in mounting (wall-mounted) |
| Protection Category IP (Standard) | IP 54 (with chopped fiber filter or pleated filter) |
| Protection Category NEMA (Standard) | NEMA Type 12 (with chopped fiber filter or pleated filter) |
| Service Life (L10 at 40°C) | 66,000 Hours at 50 Hz / 62,000 Hours at 60 Hz |
| Operating Temperature Range | -30°C to +55°C (-22°F to +131°F) |
| Storage Temperature Range | -30°C to +70°C (-22°F to +158°F) |
| Net Weight | 4.50 kg (9.92 lbs) |
| Gross Weight | 4.80 kg (10.58 lbs) |
| Standards & Certifications | UL + C-UL – FTTA, UR + C-UR Recognized, CSA, KC Korea, CE, UKCA |
| ETIM Classification | ETIM 8.0: EC000320 / ETIM 9.0: EC000320 |
| ECLASS Classification | ECLASS 8.0: 27180716 |
Applications
The Rittal SK 3244.140 filter fan unit is purpose-built for forced-air thermal management in large-format industrial electrical enclosures, motor control centers (MCCs), and main distribution switchboards. It delivers continuous, positive-pressure air filtration for variable frequency drive (VFD) lineups, automated packaging machinery, and factory floor PLC automation suites subject to fine particulate exposure. The rugged diagonal flow architecture makes it an ideal direct-fit replacement across production line assembly cabinets, CNC machine tool enclosures, and process control infrastructure.
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