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74D3000
16
BLDV7 Series Gas Fireplace
When vent termination exits through foundations less
than 0” (508 mm) below siding outcrop, the vent pipe
must flush up with the siding.
It is best to locate the fireplace in such a way that mini-
mizes the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent
pipe from the flue collar of the fireplace (or the top of the
Transition Elbow) to the face of the outer wall.
Horizontal plane means no vertical rise exists on this por-
tion of the vent assembly.
• The maximum number of 90° elbows per side wall in-
stallation is three (3). Figure 12
• If the min. 1" rise with a 90° elbow is fitted directly
on top of the first 1" section, the maximum horizontal
vent run before the termination or a vertical rise is 36”
(914 mm). Figure 13
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is re-
duced by 36” (914 mm). Figures 13 & 14. This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. Figure 12
12”
Min.
3 x 90°
Elbows
FP1176
Figure 12 -
Maximum Three (3)
90° Elbows per Instal-
lation
According to the vent graph (Page 15) the
maximum horizontal vent length in a system with a 7Z\x’
(.3 m) rise is 0’ (6 m) and if a 90° elbow is required in
the horizontal vent it must be reduced to 17’ (5. m).
In Figure 15, dimension A plus B must not be greater than
17’ (5. m)
• The maximum number of 45° elbows permitted per in-
stallation is six (6). These elbows can be installed in
either the vertical or horizontal run.
• For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18”
(457 mm). This does not apply if the 45° elbows are
installed on the vertical part of the vent system.
• The maximum number of elbow degrees in a system is
70°. Figure 15
Example: Elbow 1 = 90°
Elbow = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 70°
Max 20"
Max 20"
36"
(914mm)
Max.
36"
(914mm)
Max.
12”
(305 mm)
Min.
FP1177
Figure 13 -
Maximum Horizontal Run with 12" Minimum Rise
1
2
3
4
1
2
3
4
12”
Min.
1 + + 3 + 4 = 70°
Figure 15 -
Maximum Elbow
Usage
FP1180
7'6"
(2.3m)
A
B
A + B = 17' (Max.)
(5.2m)
Figure 14 -
Horizontal Run Reduction
FP1178
90°