CFM Corporation ODSHR42 manual 30˚ Elbow Offsets, Illustration Key

ODSHR Outdoor Woodburning Fireplace

		Chimney Requirements - Offset Installations																								OFFSET
		CHIMNEY FLUE EXIT
								CHIMNEY																RISE					IWF282
								SECTION
																30˚							30˚ Elbow Offsets
									ELBOW																	Chimney Support
									B						ELBOW							1'	1¹⁄₂'	3'	4'		Offset		Rise
															RETURN
	A											G
													30˚						G		0	0	0	0	0	3"		11"
																						1	0	0	0	0		8¹⁄₄"	20"
														OFFSET
			D																			0	1	0	0	0		11¹⁄₄"	25¹⁄₄"
						E	RISE							ELBOW								2	0	0	0	0	13¹⁄₂"		29¹⁄₄"
					6 FT.
			C											30˚				11CS				1	1	0	0	0	16¹⁄₂"		34¹⁄₄"
																						0	0	1	0	0	20¹⁄₄"		40³⁄₄"
											H		RETURN					SUPPORT
				OFFSET										ELBOW								2	1	0	0	0	21³⁄₄"		43¹⁄₂"
																			H			0	0	0	1	0	26¹⁄₄"		51¹⁄₄"
		B												30˚								0	1	1	0	0	28¹⁄₂"		55¹⁄₄"
																						1	0	0	1	0	31¹⁄₂"		60¹⁄₄”
													OFFSET
													ELBOW
																						0	1	0	1	0	34¹⁄₂"		65¹⁄₂"
					HEARTH																	0	0	2	0	0	37¹⁄₂"		70³⁄₄"
																				1	1	0	1	1	41¹⁄₂"		77³⁄₄"
					FLOOR
																						0	0	1	1	1	45"		83³⁄₄"
		Example 1								Example 2							Example 3					0	1	2	0	1	47¹⁄₄"		87¹⁄₂"
																						0	0	0	2	1	51"		94"
Notes: G + H cannot exceed 20 feet (610cm).																					FP269
																						0	1	1	1	1	53¹⁄₄"		98"
*11CF Chimney airspace clearance = 2" (51mm) minimum.
																						0	0	3	0	1	56¹⁄₄"		103¹⁄₄"
Illustration Key																						0	1	0	2	1	59¹⁄₄"		108¹⁄₂"
																						0	0	2	1	1	62¹⁄₄"		113¹⁄₂"
The following safety rules apply to offset											from the vertical plane in any installa-											0	1	3	0	1	64¹⁄₂"		117¹⁄₂"
installations (letters correspond with illustra-											tion.											0	0	1	2	1	68¹⁄₄"		124"
tion above):											D. The maximum length of the angled											0	1	2	1	1	70¹⁄₂"		128"
A. Height of the chimney is measured from																						0	0	0	3	1	74¹⁄₄"		134¹⁄₂"
											run of the total chimney system is 20
the hearth to the chimney exit.											feet. (G plus H cannot exceed 20 feet.)											0	1	1	2	2	78"		140³⁄₄"
					ODSHR42						E. A chimney support (Model 11CS)											0	0	3	1	2	81"		146"
																						0	1	0	3	2	84"		151¹⁄₄"
											is required every 6 feet of angled run
Maximum:					90' (27.4 m)
											of chimney. Chimney supports are											0	0	2	2	2	87"		156¹⁄₂"
Minimum:
											required for every 30 feet and 60 feet											0	1	3	1	2	89¹⁄₄"		160¹⁄₄"
	Without Elbows				14'6" (4.4 m)
											chimney height above the hearth.											0	0	1	3	2	93"		166³⁄₄"
	With 2 Elbows*				15'6" (4.7 m)
											Determine the offset distance of your											0	1	2	2	2	95¹⁄₄"		170³⁄₄"
	With 4 Elbows*				21'0" (6.4 m)
																						0	0	0	4	2	99¹⁄₄"		177³⁄₄"
B. Do not use more than 4 elbows per											chimney arrangement from the center-
											line of the fireplace to the centerline of											0	1	1	3	2	101¹⁄₄"		181³⁄₄"
chimney.
											the chimney where it is to pass through											0	0	3	2	2	104¹⁄₄"		186¹⁄₄"
Attach the straps of the return (top) elbow											the first ceiling.											0	1	0	4	2	107¹⁄₄"		191¹⁄₂"
to a structural framing member.
											NOTE: This offset distance may not be											0	0	2	3	2	110¹⁄₄"		196³⁄₄"
The offset (first) elbow of any pair does not
											your full offset distance. See Examples											0	1	3	2	3	114"		203¹⁄₄"
have straps.											2 and 3.											0	0	1	4	3	117³⁄₄"		209³⁄₄"
C. The chimney cannot be more than 30˚																						0	1	2	3	3	120"		213¹⁄₂"
																						0	0	0	5	3	123³⁄₄"		220"

Fig. 6 Chimney system requirements.

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