Chimney Offset Chart - Preway BI28B Installation, Service Instructions & Parts

elbow installation and chimney support
MUST BE
Number and Length
of Triple Wall Pipe
8 1 8 8 2 4 8 3 6
1018 1024 1036
0 0 0
0 0
0
1
0 0
0
1
0
0 0
0
1
0 1
0 0
0 0 2
1 1
0 0
1 0
0 0 0
0
0 0
0
0 0 2
0 3
0 0 1
0 2
0 0
1
0
0 0 3
1 0 0
0 0
0
0 0
NOTE: All Elbow Kits include Offset and Return. DO NOT use more than 15'of triple wall pipe between elbows. DO N O T
u s e more than four elbows per chimney. DO N O T e l b o w more than 30'. Elbow may be mounted directly on
fireplace.
90 FEET.
SUPPORTED EVERY 35 FEET.
Note: Support Angled
Pipe Every 6 Feet.

CHIMNEY OFFSET CHART

8" Dia.
15" Elbows
Overall
8 4 8 Overall
1048 Hgt. A Offset B
0 13% 1%
6 %
3 6 %
0 1 1 %
0 1 3 %
6 0 % 1 4 %
6 5 %
0 1 7%
1 9
1 7 7 %
2 0 %
0
2 2
0
1 9 5 2 3 %
0
2 6 %
2 1 0 6 %
1 12%
2 9 %
2 1 2 4 3 1 '/z
3 3
1 2 9 %
1 4
3 7 %
1 1 4 7 !?. >
3 1 5 3
2
4 2 %
1 1 6 4 %
4 4
3 1 70 'i
45 L/2
2 1 7 6 %
1 8 2 '.% 4 7
C H I M N E Y M U S BE
8" Dia.
30" Elbows
A
1 6 %
3 2
3 I 34
7
3 1% 1 4% 3 7'!k
4 7 % 2 2 %
5 2 %
2 5 % 5 5
5 8
6 3 %
6 9
3 7% 7 8 'a
7 8 %
8 4
8 4
8 9 %
9 9 ' 0
1 0 4 %
1 0 9 %
115 6
1 20',,4
1 4 7 %
141
1 4 6 %
7 9 %
5 I 3%
6 5
1 5 6 %
1 7 I '.&
1 7 7
1 8 2 %
9 1 %
9 4 %
a a lx
I
F O R C H I M N E Y S UP
R PLE WALL PIPE
ATTACHING SCRFWS (3)
TO RAFTERS OR JOISTS. NAIL
STRAP IN SAME WAY AS
15" Elbows
30" Elbow
A
A
1 6%
1 +'a
6 i:
3 7 %
a 1%
1 1 ',.G
5 3 %
5 8 "1
6 3 %
15%
7 4
79 '/L
a 4 !i
2 2
2 3 '
9 4 %
2 6 %
1
1 !? 1 5 !i
33
126
1 3 1 'is
3 7 34
3 9 !.'A 1 4 I 'ii
1 4 6 %
1 5 1 %
4 4
4 7
1 7 2 %
4 %
1 6 %
2 2 %
2 5 %
3 1 %
3 7 %
4 0 %
4 3 %
4 6 %
5 2 %
5 5 %
61 %
64 1%
6 7 %
7 0 %
7 3 %
7 6 %
7 9 %
8 5 %
9 1 %
9 4 %