Hearth & Home Technologies COLBAY-FS-B ユーザーズマニュアル

10/08

Page  11

Quadra-Fire  •  Columbia Bay  •  250-5195 Rev. K

The maximum horizontal vent run is 15 ft. (5m) when the 
vertical vent rise is 10 ft. (3m).

The minimum horizontal vent run is 11 in. (279mm).

Horizontal sections require a 1/4 in. (6mm) rise for every 12 
ft. (305mm) of horizontal travel.

Exterior Vent Diameter = 6 5/8 in. (168mm); Inner Vent Diam-
eter = 4 in. (101mm) 

Horizontal sections require noncombustible support every 3 
ft. (914mm), e.g. wall straps.
 
A minimum 2 ft. (610mm) vertical rise is required before the 
90 degree elbow.

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 fl ue vent to the center of the 90° elbow is  7 ft. (2m), 
the horizontal run to the outer wall fl ange must not exceed 
13 ft. (4m).

EXAMPLE 2: If the vertical dimension from the center line 
of the fl ue vent is 21 ft. (6m), the horizontal run to the outer 
wall fl ange must not exceed 9 ft. (3m).

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

pipe and each 45° elbow is equivalent to 1 ft. (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 15 ft. (5m) 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.; 15 ft. 
max. - 6 ft. = 9 ft. maximum).

NOTE: If your installation falls within the gray-shaded area 
on graph, see information on Vertical damper adjustment in 
Section 8.  (In the Commonwealth of Massachusetts, the word 
damper shall be replaced with the words flue restrictor.)

EX. 2

EX. 1

     11"   2'        4'         6'        8'       10'      12'      14'  15'

30'

28'

26'

24'

22'

20'

18'

16'

14'

12'

10'

 8'

 6'

 4'

 2'

 0'

(MAX)

(MIN)

32'

34'

35'