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Refurbished RF Shielded Rooms
Meets Buy Amaerican Act

CIR Logo 

Made in the USA 

CIR Enterprises, Inc. is a Colorado based, family owned business with over 40 years of combined RF experience. Our company is dedicated to providing premier customer service. We offer a wide range of services to meet your project needs.

CIR Refurbished Modular Solid Wall RF Shielded Rooms

CIR RF Shielded Rooms


Solid Wall


Refurbished RF Shielded Rooms


Modular Enclosures to Size Required


CIR RF Shielded Room 


Refurbished RF Shield Room 

The CIR shielded rooms will provide up to 100db min. of attenuation from 14 KHz to 10 GHz when subject to electric fields and plane waves.


CIR Shield Room During Construction

We specialize in shielded enclosure manufacturing, modification, refurbishment, installation, and RF testing.  

CIR manufactures and installs steel clad, clamp together, shielded enclosures. We recommend the steel clad system because, with its sturdy  construction, it is easily modified. 



  • All Sheet Modular Steel Chambers 
  • 3/4 MDF 28 gauge Steel Panels
  • CIR Manufactured Waveguides 
  • CIR Manufactured Pen Panel/Bulkhead


We are always looking for good used RF shielded doors. If you have any Universal, RayProof, Braden, ETS-Lindgren (knife edge) doors to sell.

Please send us an email.

 CIR-101008 RF Shielded Room For Sale



RF Shielded Room

100 DB from 14 KHz to 10 GHz


10' Wide x 10' Long x 8' High

For Industrial, Communication, and
Research and Development Applications


Price: $13,895.00 (Kit Price)







Rigid Wall, Free-Standing, Modular RF Shielded Enclosure, Floor, walls and ceiling are all rigid wall panels.

Designed to meet such high performance requirements as pager, cordless and wireless repair, cellular system production, security, research, and EMI/RFI testing and calibration.

One (1) 3' x 7' Single Knife Edge Door (Refurbished)
One (1) 12" x 12" Blank Penetration Panel
One (1) 30 Amp filter (two wire)

One (1) ground stud

Two (2) 12" x 12" waveguide vents for air flow.

New panels and structural framing

New poly and masonite underlayment

New bronze wool and flashing for seams. (Included in price)

With New Door, panels, framing & air vents $15,500.00 (Kit Price)

Installation is Available

Typical Shielding Attenuation Characteristics




Electric/Plane Waves

15KHz   400MHz   1GHz





100dB   100dB   100dB



Shielding Effectiveness (dB)

Attenuation Ratio

Percent Attenuation



                 10 : 1





                 100 : 1





                 1,000 : 1





                 10,000 : 1





                 100,000 : 1





                 1,000,000 : 1




Shielding effectiveness values are expressed in logarithmic, not linear, terms. Therefore, 80 dB of shielding effectiveness is not double the 40 dB level, but 100 times greater. Another way to express effectiveness is attenuation ratio, which compares the attenuation signal strength outside and inside the shield as shown below.

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An Electro Mechanical Research and Development (EMRAD) Corporation, Company

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