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Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 16

Napoleon gas fireplaces - installation and operating instructions

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6
when (H
) < (V
)
T
T
Simple venting configuration (only one 45º and 90° elbow)
FIGURE 29
required
vertical
rise in feet
(v
)
t
calculated horizontal vent run Plus off-
sets in feet (h
The shaded area within the lines represents acceptable
values for H
and V
T
W45-0566 / A / 07..06
bGD42CF HORIzONTAL TERMINATION
90°
45°
)
t
.
T
For vent configurations requiring more than one 45º and
90° elbow, the following formulas apply:
Formula 1: HT < VT
Formula 2: HT + VT < 40 feet
Example 1:
90°
FIGURE 30
45°
H
1
V
= 8 ft
1
V
V
= 8 ft
T
1
H
= .5 ft
1
H
=  ft
2
H
= H
+ H
= .5 +  = 4.5 ft
R
1
2
H
= .0(one 45° elbows + two 90° elbows - 5°)
O
= .0(5 - 5°) = .7 ft
H
= H
+ H
= 4.5 + .7 = 7. ft
T
R
O
H
+ V
= 7. + 8 = 5. ft
T
T
H
< V
Formula :
T
T
7. < 8
H
+ V
< 40 feet
Formula :
T
T
5. < 40
Since both formulas are met, this vent configuration is ac-
ceptable.
H
2
V
1

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