ETL 1110-3-456
16 Aug 94
infrared contrast with the surroundings. Right angles can be
avoided by sloping exterior walls or placing earth berms around
the perimeter of the structure. If vertical exterior surfaces
must be used, trees and shrubbery should be planted, as a mini-
mum, on the east and west sides of structures and close enough to
prevent direct solar radiation from falling on the walls.
b. Metal Siding and Roof Decks. Metal siding and roof decks
are large radar reflectors. Refrain from using exterior metal
surfaces.
c. Exposed Steel Framing. Exposed steel framing should be
round and not angular. Radar beams reflect off of the multiple
surfaces of exposed wide flange, channel, and angle shapes and
then present a large, easily recognizable radar signature.
d. Eaves and Cornices. Eaves and cornices should not uti-
lize right angle interfaces or re-entrant corners.
e. Windows. Windows should be avoided or the number of
windows should be kept to a minimum. Radar beams enter through
windows and reflect off of the right angles within the room. A
strong component of the reflected beam will then exit the window
as a large radar signature. Metal window frames should be
avoided because of the large radar reflectance.
A-11
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