Vermont Casting ODSR42A, ODSR36A manual Chimney Requirements Offset Installations

Majestic Fireplaces® ODSR Series "A"

Chimney Requirements - Offset Installations

CHIMNEY FLUE EXIT

		CHIMNEY
		SECTION
		ELBOW		30˚
				RETURN
		B
A			G	ELBOW
				30˚	G
D				OFFSET
	E	RISE		ELBOW
C	6 FT.			30˚	SKCS8
		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.		IWF269
Air Space Clearances: SK8 (2-wall) = 1¹⁄₂" and "S" Series (3-wall) = 2"

OFFSET

RISE

						IWF282
	30˚ Elbow Offsets
1' 1¹⁄₂'		3'	4'		Offset	Rise
			Chimney Support
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"

Illustration Key

The following safety rules apply to offset installations (letters correspond with il- lustration above):

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

ODSR36A		ODSR42A
Maximum:	90'0"	90'0"
Minimum:
Without Elbows	12' 6"	12' 6"
With 2 Elbows*	14' 6"	14' 6"
With 4 Elbows*	21' 0"	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.

* In Canada, two (2) SK845 are allowed.

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 SKCS8) is required every 6 feet of angled run of chimney. Chimney supports are required for every 30 feet and 60 feet (SK8 pipe) or 20 feet and 40 feet (3-wall pipe) of ver- tical 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	1	0	2	1	59¹⁄₄" 108¹⁄₂"
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. 5 Chimney system requirements.

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