How To Use The Vertical Sidewall Venting Graph - Vermont Castings BHDT36 Installation Instructions & Homeowner's Manual

If a 90 degree elbow is used in the horizon-
tal vent run (level height maintained) the
maximum horizontal vent length is reduced
by 36 inches. Fig. 15. This does not apply if
the 90 degree elbows are used to increase
or redirect a vertical rise.
The maximum number of elbow degrees in a system is
270º.
Sample: 1 -
2 -
3 -
4 -
Total
Example: According to the vent chart the maximum
horizontal vent length is 20' when the vertical height is 7.5'
from fireplace base height.
required in the horizontal vent it must be reduced to 17'.
2134mm
90"
2286mm
90º
45º
45º
90º
270º
Fig. 15
If one 90 degree elbow is
84"
120"
3048mm
90º elbow=3'
Fig. 16
HOW TO USE THE VENT GRAPH
1. Determine the height of the centre of the horizontal
vent pipe exiting through the outer wall. Using this
dimension on the Sidewall Vent Graph (Fig. 17),
locate the point it intersects with the slanted graph
line.
2. From the point of this intersection, draw a vertical
line to the bottom of the graph.
3. Select the indicated dimension, and position the
fireplace in accordance with same.
A:
EXAMPLE
If the vertical dimension from the floor of the unit is 11
feet (3352mm) the horizontal run to the face of the outer
wall must not exceed 14 feet (4267mm).
EXAMPLE B:
If the vertical dimension from the floor of the unit is 7 feet
(2133mm), the horizontal run to the face of the outer wall
must not exceed 8-1/2 feet (2590mm).
VERTICAL SIDEWALL VENTING GRAPH
(Dimensions in Feet)
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
3 4 5 6 7
SEE PAGE 14 FOR VENTING
REQUIREMENTS FOR SNORKELS.
- 11 -
eg: A
eg: B
8 9 10 11 12 13 14 15 16 17 18 19 20
Fig. 17