Ventilation panels / honeycombs - VH series

VENTILATION/HONEYCOMB SHIELDING - VH SERIES

Description:
Our VH Series Vents feature a selection of lightweight aluminum honeycomb vent panels, consisting of conductive airflow media left within the aluminum processing. They are designed for use in racks and other commercial enclosures.

Application:
Lightweight aluminum honeycomb vents can be mounted on most forms of shielded enclosures where airflow, cooling fans, or convection are required. They can be mounted anywhere on the enclosure and can be fitted with protective "burst plates" to protect the honeycomb material from accidental damage.
In areas exposed to the elements, the vents can be fitted with a "diagonal" honeycomb structure, which has downward-facing holes to prevent rainwater ingress. This has the added benefits of directional airflow and increased damping due to the higher aspect ratio of the cell structure.
Honeycomb vent panels are typically supplied with ready-to-install gaskets that fit either a device opening (flangeless style) or for insertion into the enclosure (flanged style). Depending on the performance requirements of the application, they can be attached with screws in frame holes or with internally threaded inserts.
Aluminum honeycomb material is created by expanding bonded aluminum foil into a honeycomb structure. This process, common to all honeycomb manufacturers, produces a material that is "polarized" and conductive both horizontally and vertically. To overcome polarization problems, two layers of honeycomb are used, mounted at 90 degrees to each other. Please contact us for more information on polarization.
Each cell in the vent acts as a waveguide, and its performance is a function of its width/height and the ratio of the cell's depth to width. A 4:1 or 5:1 aspect ratio is typically used.
Aluminum honeycomb vents are finished to suit specific applications and can be protected by Alocrom 1000, 1200, or electroplating. We can also offer RoHS-compliant lithium conversion.

PERFORMANCE - TYPICAL DB Attenuation
1MHz

FREQUENCY	WAVE	ALUMINUM
10 KHz	H	45
100 KHz	H	49
H	51
1MHz	E	>100
10MHz	E	>100
100MHz	E	>100
1GHz	P	98
10 GHz	P	95

Tolerance:
Overall dimensions: ± 0.8mm
Holes: ± 0.5mm
Mounting: with accessories ± 0.2mm

Dust filtration:
Removable dust filters are available for use with suppression filters and can be found in the VB Covers section. They are typically manufactured with AFI or AFS frames and can be mounted using quick-release fasteners for easy cleaning or replacement.