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Shielded Air Filtration Panels

air_filtration_panelsFiltering of the intake air of electronic equipment enclosures where EMI/RFI shielding is also a criteria is the task of MAJR’s line of shielded air filters. High-efficiency air filters are supplied ready to install with an EMI/RFI gasket as an integral part of the filter assembly. The rigidity of the mounting frame makes installation and removal for cleaning an easy task. The filter media used in the panels can be supplied as a dry or wet filter. Impingement of fine dust particles on filters with a glutinous oil coating is greatly enhanced.

The shielded air filter media shown represent the common sizes and mounting configurations available. In all cases, the EMI gasket is supplied as an integral part of the vent assembly.

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Features

  • Shielding, Air Flow and Dust Filtration
    Installation of the air filter into the electronic enclosure provides an effective dust filter with minimal resistance to air flow while simultaneously providing attenuation of electromagnetic interference to levels indicated in Figure 1.
  • Standard Configurations
    MAJR offers a wide variety of standard sizes, as seen below, which can reduce lead-time and setup charges for our customers.
  • Ease of Installation
    EMI/FRI shielded air filters are supplied with EMI/RFI gasket and mounting holes or captive fasteners — ready for installation into cabinet.
  • Built to Your Specifications
    Many applications require a special shape or mounting configuration. MAJR’s engineering group can assist with designs.

Design Data:

Figure 1

ventilation_panels_04 air_filtration_panels_02

 

Table 1 – Style 3031 EMI/RFI Shielded Air Filtration Panel with Through Holes

OPENING Part_Number Dry_Filter FRAME DIMENSIONS
Width Length AA BB A B C D E F G H J
3.00 (76.2) 3031-20303-57 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
5.00 (127.0) 3031-20305-57 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
11.00 (279.4) 3031-20311-57 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) 3031-20404-57 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
9.00 (228.6) 3031-20409-57 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)) 3031-20505-57 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
11.00 (279.4) 3031-20511-57 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) 1
6.00 (152.4) 3031-20606-57 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) 28
9.00 (228.6) 3031-20609-57 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
14.00 (355.6) 3031-20714-57 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) 3031-20909-57 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) 3031-21111-57 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 (335.6) 3031-21414-57 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) 3031-21818-57 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

Change -57 to -58 for Oil Coating.

 

Table 2 – Style 3033 EMI/RFI Shielded Air Filtration Panel with Through Holes

OPENING Part_Number Dry_Filter FRAME DIMENSIONS
Width Length AA BB A B C D E F G H J
3.00 (76.2) 3.00 (76.2) 3033-20303-57 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) 3033-20305-57 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) 3033-20311-57 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) 3033-20404-57 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) 3033-20409-57 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)) 3033-20505-57 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) 3033-20511-57 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) 3033-20606-57 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) 3033-20609-57 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) 3033-20714-57 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) 3033-20909-57 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) 3033-21111-57 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) 3033-21414-57 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) 3033-21818-57 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

Change -57 to -58 for Oil Coating.

 

Table 3 – Style 3036 EMI/RFI Shielded Air Filtration Panel with Through Holes

OPENING Part_Number Dry_Filter FRAME DIMENSIONS
Width Length AA BB A B C D E F G H J
3.00 (76.2) 3.00 (76.2) 3036-20303-57 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) 3036-20305-57 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) 3036-20311-57 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) 3036-20404-57 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) 3036-20409-57 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)) 3036-20505-57 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) 3036-20511-57 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) 3036-20606-57 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) 3036-20609-57 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) 3036-20714-57 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) 3036-20909-57 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) 3036-21111-57 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) 3036-21414-57 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) 3036-21818-57 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

Change -57 to -58 for Oil Coating.

 

Technical Data:

EMI/RFI Shielding

Shielding Effectiveness vs Frequency — Table 4

Shielding Effectiveness dB

Field Material Code – 57
Frequency
100
kHz
1
MHzh
18
MHz
100
MHz
400
MHz
1
GHz
10
GHz
H 52 68
E 95
PW 90 70 65 50
Field Material Code – 57 Trim Line
Frequency
100
kHz
1
MHzh
18
MHz
100
MHz
400
MHz
1
GHz
10
GHz
H 29 36
E 75
PW 60 60 60 50

The values in Table 1 show shielding characteristics for standard MAJR shielded air filters.

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.

 

Static Pressure Drop vs. Air Flow Resistance

air_filtration_panels_01

The low resistance to air flow of these panels will minimize pressure drop within the cabinet allowing air to move freely through the intake while performing the desired dust filtration function. The curves in Figure 1 show the resistance per square inch for standard filter media.

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