​ETS-Lindgren's Medical Series 81 Radio Frequency Shielded Enclosure uses a time-proven design for superior MRI RF Shielding applications, with more than 1,000 installations worldwide. ​These MRI shielded enclosures have modular panels, meaning that these enclosures can be built to almost any dimensional configuration. We custom design configurations that best fits your needs, including solutions with RF doors, RF windows, waveguides, filtering and magnet OEM system requirements.

In the heart of the RF shielding system are the 1.9 cm (.75 in) thick dimensionally-stable cores,​​ which are laminated on both sides with 28-gauge sheet steel (cores meet ANSI A208.1 specifications). The steel laminate provides the best attenuation to magnetic and electric fields​​ and plane waves.

Panels are joined together with a 3.175 mm (.125 in) "hat & flat" clamping system. No special tools are required for construction. Enclosures can be erected, dismantled, and moved to another location as needed.

Key Product Information


Series 81 RF shielding provides excellent RFI and EMI shielding effectiveness and is the most commonly specified shielding for NSA 65-6/NSA 94-106 testing requirements. Series 81 delivers high performance attenuation over a broad frequency range and complies with a variety of other specifications including:

  • Federal Specification SS-A-118B: Flame Resistance Test

  • ASTM E84-81-A: Test for Surface Burning Characteristics of Building Materials

  • ASTM E90-83: Recommended Practice for Laboratory Measurements of Airborne Sound Transmission Loss of Building Partitions

Series 81 RF shielding also complies with Universal Building Codes (UBC) and can be assembled in the most stringent seismic zones. Combining performance and value, Series 81 RF shielding meets a wide range of critical testing needs.

Medical Series 81 Shielding Applications

  • Magnetic Resonance imaging (MRI) RF Shielding

  • EMI Shielding

  • Low Field Magnetic Field Attenuation

  • Magnetic Shielding for Gauss Field Containment

  • Medical Equipment and Instrumentation
  • Biomedical Engineering Labs

Series 81 RF shielded enclosures​ consist of shielded modular panel sections that are assembled with a clamping system into a self-supporting enclosure structure. Sheets of 28-gauge galvanized steel are laminated to a 1.9 cm (.75 in) high-density particle and/or plywood board core. Each panel section provides excellent stability to airborne moisture-induced warping and structure strength that lends to its rugged structural design.

Series 81 panels are joined together with an extruded “hat and flat” and “cove” clamping system, to provide uniform and consistent pressure contact against the shielded panel mating surfaces. These structural clamping sections are zinc-plated to resist corrosion and are joined with self-taping zinc-plated fasteners,​​ spaced 10.16 cm (4.0 in)​ on center to ensure a secure shield. The corners of the shielded enclosure are secured with precision-machined trihedral end cap sections.

To maintain electrical isolation, a 6-mil dielectric vapor barrier and 3.175 mm (.125 in)​ dielectric underlayment are placed beneath the shielded floor panels. Counter-sunk floor screws in the clamping system ensure a smooth floor surface. Vinyl floor tiles are applied with adhesives over the exposed steel surface as a substrate for application of finished vinyl flooring.

Panels can be adapted to accept heavier gauge steel or aluminum for custom shielding applications in the MRI environment. This feature makes it a truly flexible RF shielding and EMI shielding solution.

Specifications Select a tab below for more information

Magnetic Field: 20 dB @ 1 KHz; 56 dB @ 10 KHz; 100 dB @ 200 KHz
Electric Field: 100 dB from 200 KHz thru 50 MHz
Plane Wave: 100 dB @ 50 MHz to 1 GHz
Microwave: 100 dB @ 10 GHz

View BIM Models of our Product Options Below:



Key Features

  • MRI RF Shielding
  • "Hat & Flat" Clamping System for Shield Integrity
  • Architectural, Electrical Options
  • Manual, Automatic RF Door Options
  • Standard and Custom Designs are Available
  • Modular Panel Construction

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Date Last Updated: Friday, August 16, 2019
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