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•
Field-fabricated spacers (1/2 in./13 mm tall, 24 ga/.024 in.
galvanized steel) must be used to support the chase top
fl ashing or chase pan, in order to provide air fl ow.
•
14 in. (345 mm) DuraChimney II pipe must extend at least
6 in. (152 mm) above the chase pan/fl ashing.
•
A DuraChimney II cap must be used inside the shroud.
•
The shroud must not be in direct contact with any of the
DuraChimney II components (other than the chase top
fl ashing).
B. House Style Shroud
The house-style shroud is roughly square or rectangu-
lar with a closed top and exhaust openings on four sides
(Figure 10.2). Table 10.1 lists the minimum shroud d9imen-
sions, the minimum open area per side, and the minimum
total open area for the shroud.
Table 10.1
Chimney
Diameter
in
mm
14
355.6
H
W
Figure 10.2 House-Style Shroud Minmum Dimensions
House Style Shroud Minimum Dimensions
Chimney Area
Min Height H
in
mm
in
mm
154
3911.6
24
609.6
Shaded area represents screened open area. Actual
shape of shroud may vary as long as minimum dimen-
L
sions and minimum open area requirements are met.
Heatilator • Birmingham BIR50 • 4059-332 Rev F • 11/08
•
All open areas of the shroud must be covered with 1/2
in. (13 mm) stainless or galvanized steel mesh screen to
prevent debris from entering the shroud.
•
Shrouds must follow the dimensional requirements
specifi ed in Tables 10.1, 10.2 or 10.3, depending on the
syle of shroud used. The three basic shroud styles are a)
House, b) Arch or Mailbox, and 3) Pyramid. Most factory-
fabricated shrouds will fall under one of these basic style
categories.
Min Length L
Min Width W
in
mm
in
mm
32
812.8
32
812.8
H: Minimum height of shroud
L: Minimum length of shroud
W: Minimum width of shroud
Min Open Area
Min Total Open
per side
Area
sq in
sq in
260
1040
33
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