Quadra-Fire GARNET-D-PMH, GARNET-MBK D. How to Use the Vent Graph, E. Venting Guidelines

D. How to Use the Vent Graph E. Venting Guidelines

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 9 ft.-8 in. (3m).

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 4 ft.-3 in. (1m).

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. max.).

NOTES

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

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 in. (152mm) vertical must be used.

EXCEPTIONS

FOR HORIZONTAL INSTALLATIONS:

The maximum horizontal vent run is 30 in. (762mm).

The maximum horizontal vent run with a 45° elbow is 18 in. (457mm).

No external minimum rise is required.

The minimum horizontal vent run is 6 in. (152mm).

NOTE: If your installation falls within the gray-shaded area on graph, see information on intake damper operation, on page 36.

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

25 ft. (8m)	25'
Maximum Vertical	24'
Example 2	22'
	20'
	18'	Adjust
	16'	Intake
VERTICAL DISTANCE		Damper
	14'
FROM APPLIANCE TO			Install Flue
90° ELBOW	12'			Restrictor
	10'
Example 1	8'								Termination
	6'								cap
6 ft. (2m) Minimum	4'
Vertical Termination
	2'
C
L		2'	4'	6'	8'	10'	12'	14'	15'
				Termination Cap
	6 in. (152mm)			30 in. (762mm) Maximum Horizontal run with no
	Minimum starter pipe			vertical pipe and with 1/4 in. (6mm) rise per foot.
Figure 5.2				Must use approved Termination Cap.

August 1, 2008 Quadra-Fire · Garnet-T · 7016-127F Page 11