Product Analysis: Pfannenberg 1337851 (PF 42-43 Rainhood)
The Pfannenberg 1337851 is a large-format Stainless Steel Rainhood designed to fit the PF 42.500 and PF 43.500 Filterfans, along with the PFA 40.000 exhaust filter. As the larger variant in the Pfannenberg rainhood family, this unit is engineered for high-airflow systems in the most demanding outdoor and marine environments. It provides the essential physical protection required to deploy high-capacity Gen 4 Filterfans in oil rigs, wastewater treatment plants, and coastal infrastructure where salt-air corrosion and driving rain are constant threats.
Advanced Protective Architecture
Fabricated from AISI 304 stainless steel, the 1337851 provides a rugged, impact-resistant shield for your cooling assembly. The hood’s deep-drawn design creates a protective cavity that allows the high-volume PF 43.500 fan to pull air efficiently while redirecting external liquid ingress to the ground. When properly installed with the included silicone gasket, the assembly achieves an IP56 and NEMA 4X rating. This ensures that even under direct high-pressure hose-down conditions, the interior of your electrical panel remains dry and operational.
Key Technical Characteristics
- Part Number: 1337851.
- Series Compatibility: PF 42.500, PF 43.500, PFA 40.000.
- Material Grade: Stainless Steel 304 (V2A).
- Protection Class: IP56 / NEMA Type 4X (when used with PF series).
- Mounting: External bolt-on design.
- Sealing: Perimeter silicone seal.
- Finish: Industrial brushed finish.
Thermal Dynamics and System Longevity
The 1337851 is designed to minimize the backpressure on high-output fans, ensuring that the 1.5kW to 3kW of heat typically managed by these fans is still effectively removed. The stainless steel housing also acts as a solar shield, reducing the direct thermal load on the Filterfan’s plastic housing, thereby preventing UV degradation and extending the mechanical life of the fan unit. This model is the premier choice for engineers seeking the highest level of mechanical and environmental safety for large-scale automation panels.
| Feature | Value |
| Mass | Approx. 2.5 kg |
| Flammability Rating | Non-combustible (Steel) |
| Operating Temp | -40 °C to +55 °C |
Technical Note
When installing the 1337851, ensure that the enclosure surface is clean and free of burrs. Tighten the mounting bolts according to Pfannenberg’s torque specifications to ensure uniform compression of the silicone seal, which is vital for maintaining the NEMA 4X certification in harsh environments.
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