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
Arch / Mailbox Style Shroud Minimum Dimensions
Chimney |
|
|
|
|
|
|
|
| Min Open Area | Min Total Open | |
Diameter | Chimney Area | Min Height H | Min Length L | Min Width W | per side | 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 |
H: Minimum height of shroud
L: Minimum length of shroud
W: Minimum width of shroud
H
Shaded area represents screened open area. Actual
WLshape of shroud may vary as long as minimum dimen- sions and minimum open area requirements are met.
Figure 10.3
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
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 |
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
WL
H1
| H2 | Shaded area represents screened open area. Actual |
|
| |
|
| shape of shroud may vary as long as minimum dimen- |
B |
| sions and minimum open area requirements are met. |
|
|
Figure 10.4
34 | Heat & Glo • |