DuraVent DuraTech Shroud - Manual (Page 6)

6
Arch / Mailbox Style Shroud Minimum Dimensions
Chimney
Diameter
(inches)
Chimney
Area
(inches)
Min
Height
H (inches)
Min
Length
L (inches)
Min
Width
W (inches)
Min
Open Area
per side (sq.
in)
Min
Total Open
Area (sq. in)
5 20 17 13 13 39 79
6 28 17 13 13 57 113
7 38 17 17 17 77 154
8 50 17 17 17 100 201
10 79 22 24 24 157 314
12 113 23 24 24 226 452
14 154 24.5 28 28 308 615
16 201 25 28 28 402 804
18 254 28 32 32 508 1016
20 314 28 32 32 628 1256
22 380 28 36 36 760 1520
24 452 28 36 36 904 1808
Figure 3
Table 2: Arch/Mailbox Style Shroud Minimum Dimensions
H: Minimum height of Shroud
L: Minimum length of Shroud
W: Minimum width of Shroud
Shaded area represents screened Open Area. Actual shape
of Shroud may vary as long as minimum dimensions and
minimum Open Area requirements are met.
H
W L
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 (2) open ends of the
arch. (Figure 3) Table 2 lists the minimum
Shroud dimensions, the minimum Open Area
per side, and the minimum Total Open Area
for the Shroud, depending on the diameter of
DuraTech chimney.