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C. Arch / Mailbox Style Shroud
The arch or mailbox style shroud generally has two solid sides and a solid top. The exhaust openings are on the two open
ends of the arch (Figure 10.3). Table 10.2 lists the minimum shroud dimensions, the minimum open area per side, and the
minimum total open area for the shroud.
Shaded area represents screened open area. Actual
shape of shroud may vary as long as minimum dimen-
sions and minimum open area requirements are met.
H
W
L
H: Minimum height of shroud
L: Minimum length of shroud
W: Minimum width of shroud
Figure 10.3 Arch/Mailbox-Style Shroud Minimum Dimensions
Table 10.2
Arch / Mailbox Style Shroud Minimum Dimensions
Chimney
Diameter Chimney Area Min Height H Min Length L Min Width W
Min Open Area
per side
Min Total Open
Area
in mm in mm in mm in mm in mm sq in sq in
14 355.6 154 3911.6 24 609.6 32 812.8 32 812.8 520 1040
D. Pyramid Style Shroud
The pyramid style shroud is roughly square or rectangular with an open top for exhaust as well as openings along the
base of the four sides (Figure 10.4). Table 10.3 lists the minimum shroud dimensions, including the minimum height and
length of the base opening.
Shaded area represents screened open area. Actual
shape of shroud may vary as long as minimum dimen-
sions and minimum open area requirements are met.
H2
W
B
H1
L
L: Minimum length of shroud top opening
W: Minimum width of shroud top opening
H1: Minimum total height of shroud
B: Minimum length of opening along base
H2: Minimum height of opening along base
Figure 10.4 Pyramid-Style Shroud Minimum Dimensions
Table 10.3
Pyramid Style Shroud Minimum Dimensions
Chimney
Diameter Min Height H1 Min Length L Min Width W Min Base B Min Height H2
in mm in mm in mm in mm in mm in mm
14 355.6 24 609.6 32 812.8 32 812.8 22 558.8 2 50.8
Heat & Glo • RUTHERFORD-50 • 4059-333 Rev C • 06/08