D. How to Use the Vent Graph

1.Measure the distance from the top of appliance 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. (2 m), the horizontal run to the outer wall flange must not exceed 13 ft. 2 in. (5m).

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

E. Venting Guidelines for Horizontal Runs

Standard Horizontal Run

Max Horizontal Run,

3 ft (914mm)

Rear Vent

 

Max Horizontal Run

15 ft (5m) when vertical rise is

 

10 ft (3m

Max Horizontal Run

14 in. (356mm)

with 45o Elbow

 

Min Horizontal Run

11 in. (279mm)

Max Wall Thickness

20 in. (508mm)

Min Wall Thickness

4 in. (102mm)

Exterior Vent Diameter

6-5/8 in. (168mm)

Inner Vent Diameter

4 inches (101mm)

Rear Vent with Vertical

Min of 2 ft vertical (610mm)

Rise

must be used prior to any hori-

 

zontal run

Horizontal Run requires a 1/4 in. (6mm) rise for every 1 ft toward the termination.

Horizontal Run requires a non-combustible support every 3 ft (914mm), i.e., plumbing tape

Horizontal Run with Snorkel Kit.

A rear vent configuration with 3 ft. (914mm) maximum horizontal run with no vertical pipe and with 1/4 in. (6mm) rise per foot.

40 ft. (12m)

40'

 

 

 

 

 

 

 

 

 

Maximum Run if

38'

 

 

 

 

 

 

 

 

 

using Stainless

 

 

 

 

 

 

 

 

 

36'

 

 

 

 

 

 

 

 

 

Steel Inner Pipe

 

 

 

 

 

 

 

 

 

Material

34'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30 ft. (9m) Maxi-

32'

 

 

 

 

 

 

 

 

 

mum Run if using

30'

 

 

 

 

 

 

 

 

 

Aluminum Inner

28'

 

 

 

 

 

 

 

 

 

Pipe Material

 

Flue Restrictor more

 

 

 

 

 

 

26'

 

 

 

 

 

 

 

 

CLOSED in this area

 

 

 

 

 

 

24'

 

 

 

 

 

 

Example 2

 

 

 

 

 

 

 

 

 

22'

 

 

 

 

 

 

 

 

 

 

20'

 

 

 

 

 

 

 

 

 

Vertical Distance

18'

 

Flue Restrictor

 

 

 

 

 

 

from Appliance Top

16'

 

 

 

 

 

 

 

to 90o Elbow

14'

 

50% CLOSED in

 

 

 

 

 

 

 

this area

 

 

 

 

 

 

 

12'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Example 1

10'

 

 

 

 

 

 

 

 

 

8'

 

 

 

 

 

 

 

 

 

 

6'

 

Flue Restrictor

 

 

 

 

 

 

 

4'

 

OPEN in this area

 

 

 

 

 

 

2'

 

 

 

 

 

 

 

 

 

 

0'

11"

2'

4'

6'

8'

10'

12'

14'

15'

 

 

(MIN)

 

 

 

 

 

(MAX)

Figure 5.2

TOTAL HORIZONTAL RUN TO THE OUTER

 

WALL FLANGE (EXCLUDING ELBOWS)

•A snorkel kit must be used. Figure 5.3 below and

Figure 5.4 on page 12.

•A derating orifice must be installed. The appropriate orifice is supplied with the rear vent kit.

Snorkel Kit

C

L

Figure 5.3

NOTE: IF YOUR INSTALLATION FALLS WITHIN A SHADED AREA ON THE GRAPH, THE FLUE RESTRICTOR MUST BE USED.

INDIVIDUAL INSTALLATIONS MAY VARY.

Percentage closed based on full range of the flue restric-

tor travel.

WARNING! Fire Risk!

•Never allow the vent to run downward.

•This could cause high temperatures and may present the possibility of a house or structure fire.

Quadra-Fire • Sapphire • 7055-116 Rev. D • 6/11

11

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Page 11
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Quadra-Fire SAPPHIRE-D-CSB, SAPPHIRE-MBK, SAPPHIRE-D-MBK How to Use the Vent Graph, Venting Guidelines for Horizontal Runs
Page 10 Page 12

SAPPHIRE-D-CSB, SAPPHIRE-D-PMH, SAPPHIRE-MBK, SAPPHIRE-D-MBK specifications

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