venting installation

Continued

Assembly and installation of double wall chimney system

Each double wall chimney section consists of a galvanized outer pipe, a stainless steel inner flue pipe and a wire spacer. The pipe sections must be assembled independently as the chimney is installed. When connecting chimney directly to the fireplace, the inner flue pipe section must be installed first with the lanced side up. The outer pipe section can then be installed over the flue pipe section with the hemmed end up. Press down on each pipe section until the lances securely engage the hem on the fireplace starter. The wire will assure the proper spacing between the inner and outer pipe sections.

Continue to assemble chimney sections as outlined above, making sure that both the inner and outer pipe sections are locked together. When installing double wall snap-lock chimney together, it is important to assure the joint between the chimney sections is locked. Check by pulling chimney upward after locking. The chimney will not come apart if properly locked. It is not necessary to add screws to keep the chimney together (exception, see Figure 15).

 

 

 

 

 

 

 

OFFSET

RISE

CHIMNEY LENGTH

A

B

12"

18"

24"

36"

48"

4 3/8"

16 3/8"

 

ELBOW

SET

ONLY

 

9 3/4"

25 1/2"

1

 

 

 

 

12 3/4"

30 3/4"

 

1

 

 

 

15"

34 3/4"

 

 

1

 

 

18"

40"

1

1

 

 

 

21 1/4"

46 1/4"

 

 

 

1

 

23 3/4"

49 1/4"

 

1

1

 

 

27 3/4"

56 3/4"

 

 

 

 

1

30"

60 3/4"

 

1

 

1

 

33"

66"

 

 

 

 

1

36"

71"

 

1

 

 

1

38 1/4"

75"

 

 

 

2

 

41 1/4"

80 1/4"

1

1

 

1

 

45"

86 3/4"

 

 

 

2

 

46 3/4"

89 1/2"

1

1

 

 

1

51"

97"

 

 

 

1

1

53 1/4"

101"

 

 

 

2

 

56 1/4"

106 1/4"

 

 

 

 

2

59 1/4"

111 1/2"

 

1

 

1

1

61 3/4"

115 1/2"

1

 

 

 

2

64 3/4"

120 3/4"

 

1

 

 

2

68 1/4"

127"

 

 

 

2

1

70"

130"

1

1

 

 

2

74 1/4"

137 1/2"

1

 

 

2

1

76 3/4"

141 1/2"

 

1

 

2

1

79 3/4"

146 3/4"

 

 

 

4

 

OFFSET CHART (22-50 FT. SYSTEM HEIGHT)

Screws

B

A

Figure 15 - Elbow Offset

Using ELBOW offsets (30E-12DM)

1.To achieve desired offset, you may install combi- nations of 12”, 18”, 24”, 36” and 48” length of double wall pipe (see offset chart and Figure 15).

2.Chimney weight above offset rests on return elbow. Straps must be securely nailed to rafters or joists (see Figure 16, details A and B).

3.Maximum length of pipe between supports (return elbow or 12S-12DM) is 6’ of angle run. Maximum of two 6’ angle run sections per chimney system (see Figure 17, page 16).

4.All pipe connections between the offset and re- turn must be secured with two screws on the outer pipe only (see Figure 15). Do not penetrate the in- ner stainless.

 

2"

See Detail A

 

 

 

Min.

 

Straps

Straps

 

Detail B

 

 

 

Angle Firestop

See Detail B

Straps Straps

Detail A

Return Elbow

Figure 16 - Ceiling Support Pipe 12S-12DM

14

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