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RF Shielded Waveguide Air Vents

Buy American Act Compliant

Universal Logo SRG Logo

Made in the USA 
Universal Shielding Corp. (USC) was established in 1972 and during this time span has provided in excess of 40,000 pre-fabricated  modular RF shielded enclosures to military, commercial and medical facilities. USC is proud to be the only company in the industry to have maintained its original ownership since its inception. Universal Shielding Corp. is the second largest RF shielding manufacturer in the United States.

Shielding Resources Group, Inc. (SRG) is an innovative, reliable manufacturer of RF shielded enclosures and components. SRG offers high quality, competitively priced products, we also service RF/EMI enclosures for technical maintenance and problem resolution.
SRG is a national and internationally recognized brand name in the RF shielding industry for Sensitive Compartmented Information Facility (SCIF) and Tempest rooms.

Universal RF Shielded Waveguide Honeycomb Air Vents

Minimal Resistance to Air Flow

Honeycomb design combines the highest shielding performance with the least resistance to air flow. Cell geometry allows the maximum amount of open space while maintaining the RFI shielding requirement of the enclosure.

RF Shielded Flange Type Air Vent

 RF Shielded (Honeycomb) Waveguide Air Vent


Air Vent Pressure Drop

Air Pressure Drop Through 3/16" Honeycomb

Honeycomb Waveguide Design

Manufactured to ANY size

36 in² & 144 in² increments are standard

Isolation collars available

1/4" x 1" Cell: 120dB ≤ 10GHz, 100dB ≤ 17GHz

3/16" x 1" Cell: 120dB ≤ 26GHz, 100dB ≤ 30GHz

1/8" x 1" Cell: 120dB ≤ 49GHz, 100dB ≤ 51GHz

Lead-Free ROHS Compliant Honeycomb Waveguide

Ideal for Modular or Welded RF Shielded Rooms for NSA 94-106, RTCA-DO-160, MIL-STD-461 & MIL-STD-188-125, up to 120dB, also ICD 705 Tempest SCIF Rooms.


Honeycomb Cell


Honeycomb Air Vent

EMI Shielded Honeycomb Air Vent

 Installation of Series 1200 & Series 1300 Waveguide Air Vents

There are other possible ways to install the air vents, this is a simple way.

Series 1200 (Inside the HVAC Duct)

Series 1300 (Wall Flange Mounted)

Large Series 1200 (Duct Type) RF Shielded Honeycomb Air Vents
Large Universal RF Sshielded Air Vents

Large USC Honeycomb Air Vents

Waveguide Air Vent Drawings

Air Vent Types

Series 1300 Flange Type

Series 1200 Duct Type

Detailed Flange Type with Collars

Bolt/Clamp In Place

Attenu-Duct Air Vents

SRG ICD 705 RF Shielded Waveguide Air Vents

Lead-Free ROHS Compliant Honeycomb Waveguide

Patented RF Shielded waveguide
For Foil Shield Rooms

RF Shielded Air Vent with Man Bars
With Security Bars

Honeycomb Air Vent with Man Bars
With Man Bars

SCIF Air Vents with Man Bars
With Security Man Bars

RF Shielded Honeycomb Air Vent

RF Shielded Honeycomb Air Vent in Suspended Ceiling
In Suspended Ceiling

RF shielded air vent for drop ceiling
In Drop Down Ceiling

Shielding Resources Group, Inc. now offers 100% lead free honeycomb waveguide vent material. This material is provided to eliminate any and all concerns of lead contamination by airborn particles.

This material exceeds all domestic and international requirements for lead free electronics and is environmentally friendly. SRG's unique and proprietary manufacturing process includes applying a thin coating of 100% tin to the raw base strip base material.

The thickness of the coating is extremely critical and must be within .0015"-.002". After the base strip material is formed, cut to the desired length and assembled as a sheet, it is placed in an oven. Under a controlled set of parameters the temperature is raised until the tin coating is allowed to flow via capillary action, a process we have named fusion bonding. Once cooled, the sheet becomes a bonded or fused honeycomb matrix offering structural and RF intergrity.

Ideal for Foil RF Shielded ICD 705 Tempest SCIF Rooms, up to 100dB

To insure each manufactured sheet maintains the required performance level in terms of shielding effectiveness, SRG has implemented a very stringent Quality Control and Assurance Program which couples 100% visual inspection along with shielding effectiveness testing performed by a NVLAP approved independent test agency


RF Shielded Air Vent Diffusers for Suspended Ceilings

RF Shielded Air Vent Diffuser

2' x 2' Air Vent Diffuser

RF Shielded Air Vent Diffuser Bottom

2' x 2' RF Shielded Diffuser - Bottom

RF Shielded Air Vent Diffuser Top

RF Shielded Air Vent Diffuser - Top

The waveguide sheets are offered in 3 forms: standard cut sheets, custom cut sheet or mounted in frames.

Standard Cell Sizes (Hexcell Opening X Depth)

Honeycomb Cell Dimensions

1/8" x 1/4"

3/16" x 1/4"


1/8" x 1/2"

3/16" x 1/2"

1/4" x 1/2"

1/8" x 5/8"

3/16" x 5/8"


1/8" x 3/4"

3/16" x 3/4" 1/4" x 3/4"

1/8" x 1"

3/16" x 1"

1/4" x 1"

Calculating Shielding Effectiveness for One Hexagon Tube

SE Honeycomb Formula

d in millimeter is a waveguide length.
g in millimeter is a transverse dimension of waveguide.
f is operating frequency in MHz.

Hexagon Dimensions

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

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