ODSHR Series

Chimney Requirements - Offset Installations

CHIMNEY FLUE EXIT

 

CHIMNEY

 

 

 

SECTION

 

 

 

ELBOW

30˚

 

 

RETURN

 

 

 

 

A

B

ELBOW

 

 

G

 

 

 

30˚

G

 

 

 

D

 

OFFSET

 

RISE

ELBOW

 

E

 

 

6 FT.

 

30˚

11CS

C

 

 

H

RETURN

SUPPORT

OFFSET

ELBOW

 

 

 

 

 

 

30˚

H

B

 

 

 

OFFSET

 

 

 

ELBOW

 

 

HEARTH

 

 

FLOOR

 

Example 1

Example 2

Example 3

Notes: G + H cannot exceed 20 feet.

FP269

 

*11CF Chimney airspace clearance = 2" minimum.

 

OFFSET

RISE

 

 

 

 

 

 

IWF282

30˚ Elbow Offsets

 

 

 

 

 

 

1'1¹⁄₂' 3'

 

4'Chimney Support

Offset

Rise

0

0

0

0

0

3"

11"

1

0

0

0

0

8¹⁄₄"

20"

0

1

0

0

0

11¹⁄₄" 25¹⁄₄"

2

0

0

0

0

13¹⁄₂" 29¹⁄₄"

1

1

0

0

0

16¹⁄₂" 34¹⁄₄"

0

0

1

0

0

20¹⁄₄" 40³⁄₄"

2

1

0

0

0

21³⁄₄" 43¹⁄₂"

0

0

0

1

0

26¹⁄₄" 51¹⁄₄"

0

1

1

0

0

28¹⁄₂" 55¹⁄₄"

1

0

0

1

0

31¹⁄₂" 60¹⁄₄”

0

1

0

1

0

34¹⁄₂" 65¹⁄₂"

0

0

2

0

0

37¹⁄₂" 70³⁄₄"

1

1

0

1

1

41¹⁄₂" 77³⁄₄"

0

0

1

1

1

45" 83³⁄₄"

0

1

2

0

1

47¹⁄₄" 87¹⁄₂"

0

0

0

2

1

51"

94"

0

1

1

1

1

53¹⁄₄"

98"

0

0

3

0

1

56¹⁄₄" 103¹⁄₄"

0

1

0

2

1

59¹⁄₄"

108¹⁄₂"

Illustration Key

The following safety rules apply to offset installations (letters correspond with illustration above):

A. Height of the chimney is measured from the hearth to the chimney exit.

 

ODSHR42

Maximum:

90'

Minimum:

 

Without Elbows

14'6"

With 2 Elbows*

15'6"

With 4 Elbows*

21'0"

B. Do not use more than 4 elbows per chimney.

Attach the straps of the return (top) elbow to a structural framing member.

The offset (first) elbow of any pair does not have straps.

C. The chimney cannot be more than 30˚ from the vertical plane in any installation.

D. The maximum length of the angled run of the total chimney system is 20 feet. (G plus H cannot exceed 20 feet.)

E. A chimney support (Model 11CS) is required every 6 feet of angled run of chimney. Chimney supports are required for every 30 feet and 60 feet chimney height above the hearth.

Determine the offset distance of your chimney arrangement from the center- line of the fireplace to the centerline of the chimney where it is to pass through the first ceiling.

Note: This offset distance may not be your full offset distance. See Examples 2 and 3.

0

0

2

1

1

62¹⁄₄" 113¹⁄₂"

0

1

3

0

1

64¹⁄₂" 117¹⁄₂"

0

0

1

2

1

68¹⁄₄"

124"

0

1

2

1

1

70¹⁄₂"

128"

0

0

0

3

1

74¹⁄₄" 134¹⁄₂"

0

1

1

2

2

78" 140³⁄₄"

0

0

3

1

2

81"

146"

0

1

0

3

2

84" 151¹⁄₄"

0

0

2

2

2

87" 156¹⁄₂"

0

1

3

1

2

89¹⁄₄" 160¹⁄₄"

0

0

1

3

2

93" 166³⁄₄"

0

1

2

2

2

95¹⁄₄" 170³⁄₄"

0

0

0

4

2

99¹⁄₄" 177³⁄₄"

0

1

1

3

2

101¹⁄₄" 181³⁄₄"

0

0

3

2

2

104¹⁄₄" 186¹⁄₄"

0

1

0

4

2

107¹⁄₄" 191¹⁄₂"

0

0

2

3

2

110¹⁄₄" 196³⁄₄"

0

1

3

2

3

114" 203¹⁄₄"

0

0

1

4

3

117³⁄₄" 209³⁄₄"

0

1

2

3

3

120" 213¹⁄₂"

0

0

0

5

3

123³⁄₄"

220"

Fig. 4 Chimney system requirements.

20002264

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Majestic Appliances ODSHR42 manual Chimney Requirements Offset Installations