Hearth & Home Technologies TOPAZ-D-CSB User Manual

September 1, 2008

Page  11

Quadra-Fire · Topaz · 7009-113G

1.  Measure the vertical distance from the center line of the 

flue pipe to the center of the 90° elbow. On the graph 
below, draw a horizontal line from that measurement 
on the vertical axis across until it intersects with the 
slanted  line.

2.  From the point of this intersection, draw a vertical line to 

the bottom of the graph.

3.  The point at which this line meets the bottom line of the 

graph is the maximum length of the horizontal run. 

EXAMPLE 1: If the vertical dimension from the center line 
of the flue vent to the center of the 90° elbow is  7 ft. (2m), 
the horizontal run to the outer wall flange must not exceed 
16 ft. (5m).

EXAMPLE 2: If the vertical dimension from the center line 
of the flue vent is 21ft. (6m), the horizontal run to the outer 
wall flange must not exceed 12 ft. 10 in. (4m).

4.  Each 90° elbow is equivalent to 3 ft. (914mm) of vent 

pipe and each 45° elbow is equivalent to 1ft. (305mm) 
of vent pipe, and must be subtracted from the vent pipe 
run. A single horizontal to vertical 90° elbow is already 
calculated into the allowable 20 ft. (6m) run. Each 
additional 90° elbow reduces the maximum horizontal 
distance by 3 ft. (914mm).

EXAMPLE: The use of 3 elbows would reduce the allowable 
horizontal run to 9 ft. (3 -1 =  2 elbows x 3 ft. = 6 ft.; 20 ft. 
max. - 6 ft. = 14 ft. max.).

NOTES
The maximum horizontal vent run is 20 ft. (6m) when the 
vertical vent rise is 10 ft. (3m).
The minimum horizontal vent run is 6 in. (152mm)
Horizontal sections require a 1/4 in. (6mm) rise for every 12 
in. (305mm) of horizontal travel.
Exterior Vent Diameter = 6-5/8 in. (168mm); Inner Vent 
Diameter = 4 in. (102mm).
Horizontal sections require noncombustible support every 3 
ft. (914mm), e.g. wall straps.
For any vertical termination a minimum of 6 ft. (2m) vertical 
must be used.

*In the Commonwealth of Massachusetts, the word damper 
shall be replaced with the words flue restrictor.

Example 1

Example 2

2'           4'          6 '          8'          10'         12'        14'   15'  16'  17'  18'  19'  20'

2'

4'

6'

8'

10'

12

'

14'

16'

18'

20'

22'

24'

26'

28'

30'

32'

34'

35'

36'

37'

38'

39'

40'

40 ft. (12m) 

Maximum Vertical

6 in. (152mm) Minimum 

Vertical Termination

For rear vent or top of 

appliance for top vent

6 in. (152mm) Minimum starter pipe

3 ft. (914mm) Maximum Horizontal run with no 
vertical pipe and with 1/4 in (6mm) rise per foot. 
Must use Snorkel cap.