Datasheet

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EMI ESSENTIALSEMI ESSENTIALS
37
37
For additional information on any of the other products available, please contact sales for assistance or visit us at www.lairdtech.com.
Laird has a proven solution for air filtration and EMI shielding in
electronic enclosures. The Electro-Air EMI/dust filtration panel,
consisting of layered, woven, and crimped wire mesh plus filtering
media (as needed), captures microscopic airborne contaminants
while providing minimal air flow impedance.
Better yet, the panel’s specially designed EMI gasket prevents
signal migration to the enclosed sensitive electronic equipment. In
fact, when measured according to MIL-STD-285, the panel provides
shielding effectiveness in excess of 60 dB for a range
of 18 MHz to 1 GHz plane wave.
CODE
NO.
FRAME
MATERIAL
FILTER
MEDIA
EMI
GASKET
PLATING
FINISH
73 Aluminum Alloy
6063-T4
GRILLE: Aluminum
Alloy 6063-T4
MEDIA: Wire
Fabric Aluminum
RR-W-385
Type VII 18x14
GROUND:
Knit Monel Wire
Per QQ-N-281
Class A
ELASTOMER:
Neoprene Sponge
MIL-R-6130
Type II Medium
Chromate Coating
Per MIL-C-5541
Class 3
74 Aluminum Alloy
6063-T4
Aluminum Alloy
1100-0
Per QQ-A-250/1,
with Polyethylene
Interlayer
Knit Monel Wire
Per QQ-N-281
Class A
Chromate Coating
Per MIL-C-5541
Class 3
METAL AND PLATING CODES
AIR FLOW VS. RESISTANCE
SHIELDING EFFECTIVENESS
If required, the panels can be supplied painted to match enclosure color.
FILTRATION PANEL SIZE DETERMINATION
STYLE 8639
1. Customer determines fan size and velocity based on their
calculated cooling requirements. Example: Fan @ 240 CFM velocity
with static pressure of 0.035 inches H
2
O.
2. Determine panel opening size so not to impede airflow
A. From Air Flow vs. Resistance graph intersect
0.035 inches on Y axis
B. Draw line to curve–this intersects at 2.3 CFM/in
2
C. Required vent opening = (240 –: 2.3) = 104 in
2
opening
D. Choose vent size with 104 in
2
opening or larger
Maximum Protection/Minimum Impedance
Electro-Air
TM
EMI/Dust
Filtration Panel
• Universal applications—ideal for small enclosures, large
housings, high traffic areas, even room size facilities
• Extensive service life—built to outlast the equipment it protects
• Variety of design specifications—modular construction is
available in assorted standard sizes from 3 to 18 sq. in.
(19,35 to 116,13 sq. cm)
• Easy installation—pre-drilled through holes or captive
fasteners allow for quick mounting and removal
• Simple maintenance—washing with mild soap solution,
rinsing, and drying as often as necessary does not degrade
performance
• Design assistance—Laird Technologies engineering department
offers technical assistance and testing data to help solve the
toughest application challenges
Features and Benefits:
VENT PANELS
ELECTRO-AIR
™
EMI/DUST FILTRATION PANEL
For additional information on any of the other products available, please contact sales for assistance or visit us at www.lairdtech.com.
ElectroVent
TM
CODE
NO.
HONEYCOMB
MATERIALS
FRAME
MATERIALS
PLATING EMI
GASKET
70 Aluminum Alloy
MIL-C-7438
Aluminum Alloy
6063-T4
Chromate Coating
MIL-C-5541
Class 3
Wire Knit: Monel
QQ-N-281 Class A
Elastomer: Neoprene
MIL-R-6130
Type Grade A Medium
71 Aluminum Alloy
MIL-C-7438
Aluminum Alloy
6063-T4
Tin Plating
MIL-T-10727
Type 1
Wire Knit: Tin Coated
Copper Clad Steel
ASTM B 520
Elastomer: Neoprene
MIL-R-6130
Type Grade A Medium
72 Steel SAE 1010 Aluminum Alloy
6063-T4*
Chromate Coating
Honeycomb only
Tin Plate
MIL-T-10727
Type 1
Wire Knit: Monel
QQ-N-281 Class A
Elastomer: Neoprene
MIL-R-6130
Type Grade A Medium
TABLE 1. CODES FOR PANEL MATERIALS
AND PLATING COMBINATIONS
*Available with tin plated steel frame if required.
1. Customer determines fan size and velocity based on their
calculated cooling requirements. Example: Fan @ 240 CFM
velocity with static pressure of 0.035 inches H
2
O.
2. Determine panel opening size so not to impede airflow
A. From graph intersect 0.035 inches on Y axis
B. Draw line to curve—this intersects at 6 CFM/in
2
C. Required vent opening = (240 –: 6) = 40 sq. in.
opening
D. Choose vent size with 40 sq. in. opening or larger
VENT PANEL SIZE DETERMINATION
SHIELDING EFFECTIVENESS FOR VARIOUS MATERIALS AND
PLATING COMBINATIONS AT 10-12 INCH LBS TORQUE
AIR FLOW VS. RESISTANCE FOR STRAIGHT
HONEYCOMB PANEL
Vent panels range from 3 in. (76,2 mm) to 18 in. (457,2 mm)
square in standard sizes, and can be ordered with either
0.50 in. (12,7 mm) thick or space-saving 0.25 in. (6,4 mm) thick
honeycombs.
Laird offers ElectroVent EMI shielding ventilation panels.
Available in a wide choice of materials, platings, and
mounting configurations, ElectroVent offers the designer new
versatility to meet EMI, environmental and mechanical system
requirements.
AVAILABLE PROTECTIVE GRILLE
For high traffic areas, all EMI ventilation panels are available with
grille installed to protect honeycomb from damage that could
impede airflow or shielding effectiveness.
• Wide choice of materials and finishes to meet a broad range of
shielding effectiveness requirements
• Varied mounting configurations to meet environmental and
space considerations
• Protective grille can be supplied
• Panel supplied with 0.25 in (6,4 mm) thick
or 0.50 in (12,7 mm) thick honeycomb
• Full EMI test of panel to MIL-STD-285 to aid in the early
stages of equipment panel design
Features and Benefits:
Static Pressure Drop (inches H
2
O)
0.35
0.30
0.25
0.20
0.15
0.10
0.05
VENT PANELS
ELECTROVENT
™