Assemble Chimney Sections; Using Offsets/Returns - Heatilator BIR50-B Owner's Manual

G. Assemble Chimney Sections
• Attach the first chimney section or offset onto
the top of the fireplace (Figure 8.3). Sheet metal
screws are required to connect chimney section
to the fireplace starter collar. Continue to add
additional sections of chimney as needed.
• Use a wall strap every eight feet of chimney
height.
• For each additional chimney section use four
of the sheet metal screws provided to make a
secure connection between the chimney sections
(Figure 8.4). Do not penetrate the inner liner of
the chimney.
Figure 8.3
Figure 8.4
26
Figure 8.5
Table 8.2
Elbow
Angle
from
Vertical
15°
15°
15°
15°
15°
30°
30°
30°
30°
30°
Heatilator • Birmingham BIR50-B • 4059-682C • 8/12
H. Using Offsets/Returns
• Use an offset/return to bypass overhead obstructions.
• An offset and return can be used as a single entity or
separated by chimney section(s).
WARNING! Rish of Fire! DO NOT use offset/returns great-
er than 30'. Chimney draft will be restricted and could cause
overheating and fire.
• Measure the shift required to avoid the overhead
obstruction (Offset, Figure 8.5).
• Find the appropriate offset dimension listed in Table 8.2.
• The rise (see Figure 8.5) coinciding with the offset
dimension measurement in Table 8.2 represents the
required vertical clearance needed to complete the offset/
return.
OFFSET
Chimney
Length
Between Offset
Elbows Inches
0 2 5/8
12 in./305 mm 5 1/2
18 in./457 mm 7 1/8
36 in./914 mm 11 3/4
48 in./1219 mm 14 7/8
0 6 1/4
12 in./305 mm 11 3/4
18 in./457 mm 14 3/4
36 in./914 mm 23 3/4
48 in./1219 mm 29 3/4
RISE
Rise Offset
Inches Millimeters Millimeters
21 5/8 67
32 1/4 140
38 181
55 3/8 298
67 378
24 1/2 159
34
298
39 1/4 375
54 7/8 603
65 1/4
756
Rise
549
819
965
1407
1702
622
864
997
1394
1657