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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.
Table 10.2
Chimney
Diameter
in
mm
14
355.6
H
W
Figure 10.3 Arch/Mailbox-Style Shroud Minimum Dimensions
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.
Table 10.3
Chimney
Diameter
in
mm
14
355.6
W
H1
Figure 10.4 Pyramid-Style Shroud Minimum Dimensions
34
Arch / Mailbox Style Shroud Minimum Dimensions
Chimney Area
Min Height H
in
mm
in
mm
154
3911.6
24
609.6
L
Pyramid Style Shroud Minimum Dimensions
Min Height H1
Min Length L
in
mm
in
mm
24
609.6
32
812.8
L
H2
B
Heatilator • Birmingham BIR50 • 4059-332 Rev F • 11/08
Min Length L
Min Width W
in
mm
in
mm
32
812.8
32
812.8
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.
Min Width W
Min Base B
in
mm
in
mm
32
812.8
22
558.8
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
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.
Min Open Area
Min Total Open
per side
Area
sq in
sq in
520
1040
H: Minimum height of shroud
L: Minimum length of shroud
W: Minimum width of shroud
Min Height H2
in
mm
2
50.8
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