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 MIL-HDBK-419A
Table 8-19
Characteristics of Commercially Available Shielded Enclosures (8-13)
Magnetic
Shielding
Effectiveness
Room Description
(dB)
(kHz)
MIN
MAX
61
56
15
Copper screen cell type
96
97
200
Styrofoam core, sheet metal skin.
54
90
15
Braided gasket material on door.
63
87
150
81
100
15
Hollow core construction. Piano
108
200
118
hinge on &or with finger stock.
80
1000
100
29 mil sheet metal bonded to 3/4" plywood base
panel (2 sides) with bolted seam clamps. Three
point suspension of personnel door. 20/50 foot
overhead door with double row finger stock.
64
93
18
Construction similar to above,
95
150
120
except no overhead door.
34
58
14
26 gauge steel with folded and soldered seams
58
75
280
between panels. Commercially available door
with double row of beryllium copper finger stock.
All power lines provided with filters.
70
65
14
Continuously soldered 20 gauge sheet metal with
90
100
1.25
zinc electroplate. Two commercial
doors with finger stock (2 rows). Power line
filtering installed. Room size = 20 x 20 x 8 feet.
74
90
14
Continuously inert-gas welded sheet steel, 12 gauge
106
130
200
with overlapping seams. Standard commercial
shielded room door with double row finger stock.
8-67
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