EMI RFI shield ventilation air filter for faraday cage
EMI shielding vent panels or attenuvents are made from aluminium or steel honeycomb mounted into a frame. Many aluminium frame styles are available together with different thicknesses and configuration of honeycomb to meet different shielding requirements. Protective grilles are available for vulnerable areas together with dust filtration foams. Many plated or painted finishes can be specified.
1. Material:Steel, brass,stainless steel,aluminum
2. standard size: 300x300mm, 300x600mm
3. Standard cell size: 3.2/4.0/4.8mm
4. MOQ 1 piece
| Product Features | |
| Honeycomb filter use for shielding room and cabinet | |
| Materials: Steel, brass, Aluminum, Stainless steel | |
| The waveguide vent provides maximum RF attenuation while allowing optimum airflow | |
| We can also produce various customized specification for civil or military use according to customer`s requirements. | |
| High quality, Reasonable price and Short delivery, sample order accept | |
| Technical Specifications | |
| Honeycomb Standard Thickness(mm) | 12.5mm/19mm/25mm/50mm |
| Honeycomb standard size | 300x300/300x600/450x450/600x600mm |
| Hole size | 3.2mm/4.0mm/4.8mm |
| The frame materials | Brass, Steel, Stainless steel |
| MOQ | 1PCS |
| Shielding Performance | |
| Magnetic field | 14KHz≥75dB 150KHz≥100dB |
| Electric field | 200KHz-50MHz≥110dB |
| Flatwave | 50MHz-1GHz≥110dB |
| Microwave |
1GHz-10GHz≥100dB 10GHz-18GHz≥90dB |
Balanced Airflow and Shielding Performance
The panel achieves a rare balance: allowing substantial airflow via its carefully engineered honeycomb waveguide structure while simultaneously suppressing electromagnetic leakage. Inspired by the approach of emi filter manufacturers to block conducted interference, the vent panel applies equivalent principles in the radiated domain. This means ventilation can proceed without opening a significant vulnerability in the shielding envelope. The design ensures that despite active air exchange, high-frequency emissions cannot create unwanted coupling paths — maintaining the integrity of EMI filter systems, RF shield boxes, and EMC test environments.
Durable Construction with Integration-Friendly Design
Built from premium stainless steel, the vent panel is suited for industrial and medical installations alike — from MRI shielding suites to telecom shelters. The flange mounting design and gasket interface support straightforward integration into walls, ceilings or rack enclosures. The product reflects the exacting workmanship of projects delivered by power line filter manufacturers and 3-phase EMI filter manufacturer frameworks, with predictable performance, mechanical resilience and maintenance-friendly layout. Its material choice and design lifetime considerations provide a reliable solution in environments where equipment uptime and shielding reliability are critical.
Optimised for Low Pressure Drop, Minimal EMI Risk and Long-Term Reliability
Through simulation and testing, the waveguide honeycomb geometry is optimised for minimal airflow resistance (low pressure drop) — important for HVAC efficiency and fan load. At the same time, the structure behaves like a passive low-pass filter, disrupting RF propagation and supporting EMI shielding. This is analogous to how lowpass filters, ac filters and other emi filter circuits are designed to manage interference without sacrificing system performance. The panel ensures long-term shielding behaviour with minimal maintenance; its grounding and mounting design reduce the likelihood of grounding degradation over time. For installations involving PDUs, line filters, shielded rooms and sensitive measurement equipment (emc test facilities), this reliability is essential.
RF/EMC Shielded Rooms and Test Chambers
In specialized EM environments such as anechoic or reverberation chambers, shielded rooms for EMC testing, or MRI Faraday cages, maintaining ventilation without compromising shielding is challenging. The 25 mm waveguide honeycomb air vent panel addresses this by enabling necessary airflow for HVAC or equipment cooling, while preserving a tight shielding envelope. When combined with EMI filters and other shielding components, it ensures that the room remains compliant with test protocols and interference control requirements. It aligns perfectly with installations where facility engineers expect performance similar to systems developed by emi filter manufacturers and rf shield box manufacturers.
Power Distribution Enclosures and EMI Filter Racks
Many industrial facilities house large power distribution units (PDUs) or EMI filter banks that generate heat and require ventilation. Installing a standard vent could undermine shielding, but this panel allows airflow and cooling while maintaining electromagnetic integrity. In such scenarios — often addressed by single phase emi filter manufacturers or 3-phase emi filter manufacturer systems — the vent serves as both a mechanical component and part of the shielding chain. Control rooms, manufacturing automation cabinets, inverter drive racks and filter cabins all benefit from this integrated solution.
Telecommunications, Medical and Secure Electronics Installations
Data centres, telecom shelters, base station huts, MRI suites or secure control rooms all demand both environmental control (ventilation, cooling) and stringent EMI/RFI protection. This vent panel fits these installations by offering a standardized, robust ventilation solution aligned with electromagnetic shielding requirements. Installing the panel ensures air-exchange and equipment cooling while safeguarding against interference and radiated emissions — ideal for sensitive installations where both performance and compliance matter deeply.
Founded and operating under Changzhou Hezi International Trading Co., Ltd. (also branded as Haozhuo), we specialize in providing advanced EMI/EMC solutions for global industrial, military and commercial customers. Our core business includes the manufacture and supply of power line filters, signal line filters, feed-through filters, absorbers (such as pyramid and ferrite tile types), RF shielding gaskets and copper foils, honeycomb ventilation panels, RF shielding rooms and shielding boxes.
As a professional and renowned EMI filter manufacturer, our technical team possesses over a decade of experience in designing and integrating filter technologies, including for inverter drives, solar inverters, rail transit systems and servo applications. We maintain a state-of-the-art laboratory equipped with shielding rooms, surge generators, spectrum analyzers, LCR digital bridges and standard signal sources—enabling us to support full EMC testing and custom design services.
Our mission is to enable dependable, interference-free operation for our clients. Whether the requirement is to supply single phase or three phase EMI filters, low pass filter solutions, ac filter systems, or full electromagnetic shielding enclosures, we provide a one-stop solution across the spectrum of EMI/EMC infrastructure. We serve as both industrial filter manufacturers and emi filter company partners, committed to high quality, efficient lead times and cost-effective customization.
With expertise spanning RF shielding boxes, honeycomb ventilation panels, filter systems and shielding rooms, we understand both the airflow and shielding requirements of modern installations. From power distribution units in industrial settings to sensitive MRI suites or telecom shelters, our products support electromagnetic shielding, emi shielding and system-level EMC filter performance. We invite you to engage with our technical team to assess your EMI/EMC challenge and deliver a tailored solution.
