5
ODSHR Series
20002264
Chimney Requirements - Offset Installations00000 3" 11"
10000 8¹⁄₄"20"
01000 11¹⁄₄"25¹⁄₄"
20000 13¹⁄₂"29¹⁄₄"
11000 16¹⁄₂"34¹⁄₄"
00100 20¹⁄₄"40³⁄₄"
21000 21³⁄₄"43¹⁄₂"
00010 26¹⁄₄"51¹⁄₄"
01100 28¹⁄₂"55¹⁄₄"
10010 31¹⁄₂"60¹⁄₄”
01010 34¹⁄₂"65¹⁄₂"
00200 37¹⁄₂"70³⁄₄"
11011 41¹⁄₂"77³⁄₄"
00111 45" 83³⁄₄"
01201 47¹⁄₄"87¹⁄₂"
00021 51" 94"
01111 53¹⁄₄"98"
00301 56¹⁄₄"103¹⁄₄"
01021 59¹⁄₄"108¹⁄₂"
00211 62¹⁄₄"113¹⁄₂"
01301 64¹⁄₂"117¹⁄₂"
00121 68¹⁄₄"124"
01211 70¹⁄₂"128"
00031 74¹⁄₄"134¹⁄₂"
01122 78"140³⁄₄"
00312 81" 146"
01032 84"151¹⁄₄"
00222 87"156¹⁄₂"
01312 89¹⁄₄"160¹⁄₄"
00132 93"166³⁄₄"
01222 95¹⁄₄"170³⁄₄"
00042 99¹⁄₄"177³⁄₄"
01132101¹⁄₄"181³⁄₄"
00322104¹⁄₄"186¹⁄₄"
01042107¹⁄₄"191¹⁄₂"
00232110¹⁄₄"196³⁄₄"
01323 114" 203¹⁄₄"
00143117³⁄₄"209³⁄₄"
01233 120" 213¹⁄₂"
00053123³⁄₄"220"
30˚ Elbow Offsets
1' 1¹⁄₂'3' 4'
Chimney
Support
Offset Rise
Notes: G + H cannot exceed 20 feet.
*11CF Chimney airspace clearance = 2" minimum.
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.
FP269
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.
OFFSET
RISE
IWF282
Fig. 4 Chimney system requirements.
DRISE
BG
H
B
OFFSET
C
E
6 FT.
G
H
A
HEARTH
FLOOR
CHIMNEY
SECTION
CHIMNEY FLUE EXIT
ELBOW
30˚
OFFSET
ELBOW
30˚
OFFSET
ELBOW
30˚
RETURN
ELBOW
30˚
RETURN
ELBOW