BFC36 Balance Flue Heat-Circulating Fireplace

Chimney Requirements - Offset Installations

CHIMNEY FLUE EXIT

 

 

Chimney

 

 

 

 

Section

 

 

 

 

Elbow

 

30°

 

 

 

Return

 

 

 

 

A

 

B

G

Elbow

 

 

 

 

 

 

 

 

30°

G

 

 

 

 

D

 

 

Offset

 

E

Rise

Elbow

 

 

 

 

C

6 FT.

 

 

TCS8A

 

 

30°

 

 

H

Return

Support

 

 

 

 

Offset

Elbow

 

 

 

 

H

 

 

 

30°

B

 

 

 

 

 

Offset

 

 

 

 

Elbow

 

 

Hearth

 

 

Floor

 

Example 1

Example 2

Example 3

Notes: G + H cannot exceed

20 feet.

FP269

 

Air Space Clearances:

= 2” Min. to Combustibles

 

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⁄"

20"

0

1

0

0

0

11¹⁄" 25¹⁄"

2

0

0

0

0

13¹⁄" 29¹⁄"

1

1

0

0

0

16¹⁄" 34¹⁄"

0

0

1

0

0

20¹⁄" 40³⁄"

2

1

0

0

0

21³⁄" 43¹⁄"

0

0

0

1

0

26¹⁄" 51¹⁄"

0

1

1

0

0

28¹⁄" 55¹⁄"

1

0

0

1

0

31¹⁄" 60¹⁄

0

1

0

1

0

34¹⁄" 65¹⁄"

0

0

2

0

0

37¹⁄" 70³⁄"

1

1

0

1

1

41¹⁄" 77³⁄"

0

0

1

1

1

45" 83³⁄"

0

1

2

0

1

47¹⁄" 87¹⁄"

0

0

0

2

1

51"

94"

0

1

1

1

1

53¹⁄"

98"

0

0

3

0

1

56¹⁄" 103¹⁄"

0

1

0

2

1

59¹⁄"

108¹⁄"

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.

 

BFC36

Maximum:

50’0”

Minimum:

 

Without Elbows

14’6”

With 2 Elbows*

14’6”

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˚ (45˚ in Canada) 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 TCS8A) is required every 6 feet of angled run of chimney. Chimney supports are required for every 30 feet and 60 feet of vertical chimney height above the hearth.

Determine the offset distance of your chimney arrangement from the centerline 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⁄" 113¹⁄"

0

1

3

0

1

64¹⁄" 117¹⁄"

0

0

1

2

1

68¹⁄"

124"

0

1

2

1

1

70¹⁄"

128"

0

0

0

3

1

74¹⁄" 134¹⁄"

0

1

1

2

2

78" 140³⁄"

0

0

3

1

2

81"

146"

0

1

0

3

2

84" 151¹⁄"

0

0

2

2

2

87" 156¹⁄"

0

1

3

1

2

89¹⁄" 160¹⁄"

0

0

1

3

2

93" 166³⁄"

0

1

2

2

2

95¹⁄" 170³⁄"

0

0

0

4

2

99¹⁄" 177³⁄"

0

1

1

3

2

101¹⁄" 181³⁄"

0

0

3

2

2

104¹⁄" 186¹⁄"

0

1

0

4

2

107¹⁄" 191¹⁄"

0

0

2

3

2

110¹⁄" 196³⁄"

0

1

3

2

3

114" 203¹⁄"

0

0

1

4

3

117³⁄" 209³⁄"

0

1

2

3

3

120" 213¹⁄"

0

0

0

5

3

123³⁄"

220"

Fig. 3 Chimney system requirements.

7412647

5

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Image 5
Vermont Casting 647 BFC manual Chimney Requirements Offset Installations

647 BFC specifications

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