View the Medical EMI/RFI Shielded Waveguide Air Vents product features below
Typical Mounting Methods
Since the vent-to-shield seal is normally the limiting factor in shielding performance, the following waveguide-to-shield seal is required.
The aluminum waveguides come with a welded perimeter flange with countersunk mounting holes 3" on center to screw the waveguide to the RF shield wall or ceiling. The flange is bronze arc sprayed to prevent any galvanic reaction between disimilar metals.
Contact surfaces of the RF shield should be rigid enough to carry even pressure along the flange for maximum shielding performance.Duct Fastening
Maximum RF enclosure-to-vent shield performance is achieved by taking the necessary precautions to avoid incompatible metal reactions and by spacing the fasteners at no more than (3 in) on center.
Whenever metal ducts are connected to the waveguide air vents on the outside shielded wall or ceiling, a dielectric spacing collar is needed to create a non-conducting break on the duct. The purpose of this break is to keep RF currents on the surface of metal ducts from transferring to the shield wall and lowering shielding effectiveness. The dielectric break may take the form of a rubber or canvas boot, a wooden spacing collar, or other dielectric medium.
Minimum Resistance to Air Flow
The aluminum tube design combines the highest shielding performance with the lowest resistance to air flow. Tube geometry allows the maximum amount of open space while uniformity and depth of the tubes reduces air turbulence.