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Honeycomb Ventilation Panels

HSG Electronics and FabricationMAJR’s line of ready-to-install honeycomb ventilation panels provide optimum EMI/RFI shielding with minimum pressure drop for the ventilating air. Shielding effectiveness is accomplished using waveguide design principles.

The choice of which honeycomb ventilation panel will best meet your design considerations is based on three main criteria: Shielding, Air Flow and Mounting. For most applications, aluminum Code-32 honeycomb (properly installed using MAJR’s mounting frame with integral EMI/RFI gasket) will provide a degree of attenuation that will be within specification limits (See Table 1). However, for the lower frequency range (H-Field) it may be necessary to specify MAJR’s material Tin Plated Steel Code-44.

 

Features

  • Built to Your Specifications
    MAJR’s engineering team can assist with applications requiring special mounting or shape.
  • Optimum Shielding and Air Flow
    Installation of the honeycomb — with its 4:1 opening to depth ratio — provides the waveguide below cut-off effect required to attenuate EMI/RFI interference while not impeding the air flow required to cool the packaged enclosure.
  • Standard Configurations
    MAJR offers a wide variety of standard sizes, as seen below, which can reduce lead-time and setup charges for our customers.
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Call Us at 877-625-7776

Figure 1 -Style 3031 Honeycomb Ventilation Panel with Through Holes

ventilation_panels_04

 

air_filtration_panels_02

Table 1

OPENING Part_Number_
FRAME DIMENSIONS
Width Length AA BB A B C D E F G H J
3.00 (76.2) 3.00 (76.2) 3031-20303-XX 4.00 (101.6) 4.00 (101.6) 3.50 (88.9) 3.50 (88.9) 1.75 (44.5) 1.75 (44.5) 4
3.00 (76.2) 5.00 (127.0) 3031-20305-XX 6.00 (152.4) 4.00 (101.6) 5.50 (139.7) 3.50 (88.9) 1.00 (25.4) 1.75 (44.5) 1 3.50 (88.9) 6
3.00 (76.2) 11.00 (279.4) 3031-20311-XX 12.00 (304.8) 4.00 (101.6) 11.50 (292.1) 3.50 (88.9) 1.25 (31.8) 1.75 (44.5) 3 3.00 (76.2) 10
4.00 (101.6) 4.00 (101.6) 3031-20404-XX 5.00 (127.0) 5.00 (127.0) 4.50 (114.3) 4.50 (114.3) .750 (19.1) 2.25 (57.2) 1 3.00 (76.2) 6
4.00 (101.6) 9.00 (228.6) 3031-20409-XX 10.00 (254.0) 5.00 (127.0) 9.50 (241.3) 4.50 (114.3) 1.25 (31.8) 2.25 (57.2) 2 3.50 (88.9) 8
5.00 (127.0) 5.00 (127.0)) 3031-20505-XX 6.00 (152.4) 6.00 (152.4) 5.50 (139.7) 5.50 (139.7) 1.00 (25.4) 1.00 (25.4) 1 3.50 (88.9) 1 3.50 (88.9) 8
5.00 (127.0) 11.00 (279.4) 3031-20511-XX 12.00 (304.8) 6.00 (152.4) 11.50 (292.1) 5.50 (139.7) 1.25 (31.8) 1.00 (25.4) 3 3.00 (76.2) 1 3.50 (88.9) 12
6.00 (152.4) 6.00 (152.4) 3031-20606-XX 7.00 (177.8) 7.00 (177.8) 6.50 (165.1) 6.50 (165.1) 1.50 (38.1) 1.50 (38.1) 1 3.50 (88.9) 1 3.50 (88.9) 8
6.00 (152.4) 9.00 (228.6) 3031-20609-XX 10.00 (254.0) 7.00 (177.8) 9.50 (241.3) 6.50 (165.1) 1.25 (31.8) 1.50 (38.1) 2 3.50 (88.9) 1 3.50 (88.9) 10
7.00 (177.8) 14.00 (355.6) 3031-20714-XX 15.00 (381.0) 8.00 (203.2) 14.50 (368.3) 7.50 (190.5) .750 (19.1) .750 (19.1) 4 3.25 (82.6 2 3.00 (76.2) 16
9.00 (228.6) 9.00 (228.6) 3031-20909-XX 10.00 (254.0) 10.00 (254.0) 9.50 (241.3) 9.50 (241.3) 1.25 (31.8) 1.25 (31.8) 2 3.50 (88.9) 2 3.50 (88.9) 12
11.00 (279.4) 11.00 (279.4) 3031-21111-XX 12.00 (304.8) 12.00 (304.8) 11.50 (292.1) 11.50 (292. 1.25 (31.8) 1.25 (31.8) 3 3.00 (76.2) 3 3.00 (76.2) 16
14.00 (355.6) 14.00 (335.6) 3031-21414-XX 15.00 (381.0) 15.00 (381.0) 14.50 (368.3) 14.50 (368.3) 1.25 (31.8) 1.25 (31.8) 4 3.00 (76.2) 4 3.00 (76.2) 20
18.00 (457.2) 18.00 (457.2) 3031-21818-XX 19.00 (482.6) 19.00 (482.6) 18.50 (469.9) 18.50 (469.9) 1.75 (44.5) 1.75 (44.5) 5 3.00 (76.2) 5 3.00 (76.2) 24

Table 2 – Style 3033  Honeycomb Ventilation Panel with Through Holes

OPENING Part_Number_
FRAME DIMENSIONS
Width Length AA BB A B C D E F G H J
3.00 (76.2) 3.00 (76.2) 3033-20303-XX 4.25 (107.9) 4.25 (107.9) 3.50 (88.9) 3.50 (88.9) 1.75 (44.5) 1.75 (44.5) 4
3.00 (76.2) 5.00 (127.0) 3033-20305-XX 6.25 (158.8) 4.25 (107.9) 5.50 (139.7) 3.50 (88.9) 1.00 (25.4) 1.75 (44.5) 1 3.50 (88.9) 6
3.00 (76.2) 11.00 (279.4) 3033-20311-XX 12.25 (311.2) 4.25 (107.9) 11.50 (292.1) 3.50 (88.9) 1.25 (31.8) 1.75 (44.5) 3 3.00 (76.2) 10
4.00 (101.6) 4.00 (101.6) 3033-20404-XX 5.25 (133.4) 5.25 (133.4) 4.50 (114.3) 4.50 (114.3) .750 (19.1) 2.25 (57.2) 1 3.00 (76.2) 6
4.00 (101.6) 9.00 (228.6) 3033-20409-XX 10.25 (260.4) 5.25 (133.4) 9.50 (241.3) 4.50 (114.3) 1.25 (31.8) 2.25 (57.2) 2 3.50 (88.9) 8
5.00 (127.0) 5.00 (127.0)) 3033-20505-XX 6.25 (158.6) 6.25 (158.6) 5.50 (139.7) 5.50 (139.7) 1.00 (25.4) 1.00 (25.4) 1 3.50 (88.9) 1 3.50 (88.9) 8
5.00 (127.0) 11.00 (279.4) 3033-20511-XX 12.25 (311.2) 6.25 (158.6) 11.50 (292.1) 5.50 (139.7) 1.25 (31.8) 1.00 (25.4) 3 3.00 (76.2) 1 3.50 (88.9) 12
6.00 (152.4) 6.00 (152.4) 3033-20606-XX 7.25 (184.2) 7.25 (184.2) 6.50 (165.1) 6.50 (165.1) 1.50 (38.1) 1.50 (38.1) 1 3.50 (88.9) 1 3.50 (88.9) 8
6.00 (152.4) 9.00 (228.6) 3033-20609-XX 10.25 (260.4) 7.25 (184.2) 9.50 (241.3) 6.50 (165.1) 1.25 (31.8) 1.50 (38.1) 2 3.50 (88.9) 1 3.50 (88.9) 10
7.00 (177.8) 14.00 (355.6) 3033-20714-XX 15.25 (387.4) 8.25 (209.6) 14.50 (368.3) 7.50 (190.5) 1.50 (38.1) 1.50 (38.1) 3 3.50 (88.9) 1 3.50 (88.9) 16
9.00 (228.6) 9.00 (228.6) 3033-20909-XX 10.25 (260.4) 10.25 (260.4) 9.50 (241.3) 9.50 (241.3) 1.25 (31.8) 1.25 (31.8) 2 3.50 (88.9) 2 3.50 (88.9) 12
11.00 (279.4) 11.00 (279.4) 3033-21111-XX 12.25 (311.2) 12.25 (311.2) 11.50 (292.1) 11.50 (292. 1.25 (31.8) 1.25 (31.8) 3 3.00 (76.2) 3 3.00 (76.2) 16
14.00 (355.6) 14.00 (335.6) 3033-21414-XX 15.25 (387.4) 15.25 (387.4) 14.50 (368.3) 14.50 (368.3) 1.25 (31.8) 1.25 (31.8) 4 3.00 (76.2) 4 3.00 (76.2) 20
18.00 (457.2) 18.00 (457.2) 3033-21818-XX 19.25 (488.9) 19.25 (488.9) 18.50 (469.9) 18.50 (469.9) 1.75 (44.5) 1.75 (44.5) 5 3.00 (76.2) 5 3.00 (76.2) 24

 

 

Table 3 – Style 3036 Honeycomb Ventilation Panel with Through Holes

OPENING Part_Number_
FRAME DIMENSIONS
Width Length AA BB A B C D E F G H J
3.00 (76.2) 3.00 (76.2) 3036-20303-XX 5.25 (133.4) 5.25 (133.4) 4.50 (114.3) 4.50 (114.3) 2.25 (57.2) 2.25 (57.2) 4
3.00 (76.2) 5.00 (127.0) 3036-20305-XX 7.25 (184.15 5.25 (133.4) 6.50 (165.2) 4.50 (114.3) 1.75 (44.5) 2.25 (57.2) 1 3.50 (88.9) 6
3.00 (76.2) 11.00 (279.4) 3036-20311-XX 13.25 (336.6) 5.25 (133.4) 12.50 (317.5) 4.50 (114.3) 1.75 (44.5) 2.25 (57.2) 3 3.00 (76.2) 10
4.00 (101.6) 4.00 (101.6) 3036-20404-XX 6.25 (158.8) 6.25 (158.8) 5.50 (139.7) 5.50 (139.7) 1.00 (25.4) 1.00 (25.4) 1 3.50 (88.9) 1 3.50 (88.9) 8
4.00 (101.6) 9.00 (228.6) 3036-20409-XX 11.25 (366.6) 6.25 (158.8) 10.50 (266.7) 5.50 (139.7) .75 (19.1) 1.00 (25.4) 3 3.00 (76.2) 1 3.50 (88.9) 12
5.00 (127.0) 5.00 (127.0)) 3036-20505-XX 7.25 (184.15 7.25 (184.15 6.50 (165.2) 6.50 (165.2) .50 (12.7) 1.50 (38.1) 2 2.75 (69.9) 1 3.50 (88.9) 10
5.00 (127.0) 11.00 (279.4) 3036-20511-XX 13.25 (336.6) 7.25 (184.15 12.50 (317.5) 6.50 (165.2) 1.00 (25.4) 1.50 (38.1) 3 3.50 (88.9) 1 3.50 (88.9) 12
6.00 (152.4) 6.00 (152.4) 3036-20606-XX 8.25 (209.6) 8.25 (209.6) 7.50 (190.5) 7.50 (190.5) .75 (19.1) .75 (19.1) 2 3.00 (76.2) 2 3.00 (76.2) 12
6.00 (152.4) 9.00 (228.6) 3036-20609-XX 11.25 (285.7) 8.25 (209.6) 10.50 (266.7) 7.50 (190.5) .75 (19.1) .75 (19.1) 2 3.00 (76.2) 2 3.00 (76.2) 14
7.00 (177.8) 14.00 (355.6) 3036-20714-XX 16.25 (412.8) 9.25 (234.9) 15.50 (393.7) 8.50 (215.9) .75 (19.1) .75 (19.1) 4 3.50 (88.9) 2 3.50 (88.9) 16
9.00 (228.6) 9.00 (228.6) 3036-20909-XX 11.25 (285.7) 11.25 (285.7) 10.50 (266.7) 10.50 (266.7) .75 (19.1) .75 (19.1) 3 3.00 (76.2) 3 3.00 (76.2) 16
11.00 (279.4) 11.00 (279.4) 3036-21111-XX 13.25 (336.6) 13.25 (336.6) 12.50 (317.5) 12.50 (317.5) 1.00 (25.4) 1.00 (25.4) 3 3.50 (88.9) 3 3.50 (88.9) 16
14.00 (355.6) 14.00 (335.6) 3036-21414-XX 16.25 (412.8) 16.25 (412.8) 15.50 (393.7) 15.50 (393.7) .75 (19.1) .75 (19.1) 4 3.50 (88.9) 4 3.50 (88.9) 20
18.00 (457.2) 18.00 (457.2) 3036-21818-XX 20.25 (514.35) 20.25 (514.35 19.50 (495.3) 19.50 (495.3) .75 (19.1) .75 (19.1) 6 3.00 (76.2) 6 3.00 (76.2) 28

 

 

Design Data

Shielding Effectiveness vs Frequency — Table 4
Chromate Finish

Shielding Effectiveness dB

Field Aluminum Material Code – 32
Frequency
100
kHz
1
MHzh
18
MHz
100
MHz
400
MHz
1
GHz
10
GHz
H 35 50
E 75
PW 75 75 65 50

The data in Table 4 shows shielding characteristics for standard MAJR shielded vents. Note that the data indicated is based on a unit whose opening was 12.00 x 12.00 (305 x 305 mm) and tested under laboratory conditions per MIL-STD 285.

Table 4 (Continued)

Shielding Effectiveness dB

Field Aluminum Tin Plate Material Code – 42
Frequency
100
kHz
1
MHzh
18
MHz
100
MHz
400
MHz
1
GHz
10
GHz
H 65 80
E 100
PW 95 95 95 90
Field Steel Tin Plate Material Code – 44
Frequency
100
kHz
1
MHzh
18
MHz
100
MHz
400
MHz
1
GHz
10
GHz
H 75 80
E 110
PW 110 110 110 100

Air Flow Resistance — Figure 1

The low resistance to air flow of MAJR’S shielded honeycomb panels will minimize pressure drop within cabinet, allowing air to move freely through the intake and exhaust to perform the desired cooling function. The curves in Figure 1 show the resistance per square inch for standard honeycomb vents.

ventilation_panels_01

 

 

 

 

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