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Elbow Strap
30° or 15°
Elbow
Figure 8.6
Elbow Strap
1 per
Section
Figure 8.7
I. Offset Elbow Installation
A 30° Elbow (measured from the vertical) is the largest that
can be used in an offset. A 30° Elbow may not be combined
with another Elbow to make a steeper offset (e.g. two 30°
Elbows are not allowed to be put together to form a 60°
elbow.). Avoid Elbows if possible. A totally vertical chimney
is more efcient. When Elbows are necessary to avoid
obstructions such as rafters, ridgepoles, or joists, you are
only allowed to use 2 pair of Elbows in any one chimney
system. Horizontal runs of chimney violate building code
and are not allowed.
• Attach elbows
Attach elbow to chimney section or other elbow by ating the
male and female ends with each other and using four sheet
metal screws provided. Attach one elbow to the chimney
section below, and align it for the offset. Determine the
required offset length and attach an appropriate length (or
lengths) of chimney section(s) above the elbow. Attach the
second elbow above the chimney section to complete the
offset (Figure 8.6).
• Secure offset
Use an elbow strap to secure the offset. Secure the elbow
strap’s band to chimney around the upper portion of the
top elbow, then tighten the nut and bolt until the clamp
is rm. Wrap the elbow strap end over an adjacent joist
or rafter and secure it with at least two 8-penny nails or
two #8, 1-1/2” screws. Add additional elbow straps for
each section of chimney in the offset (Figure 8.7). Every
chimney section in the offset must be supported. Do not
add more chimney sections until the elbows and offset are
supported. Be sure that the chimney remains vertical.
Chase
Frame
Stabilizer
Plumbers
Tape
Install supplementary
support if height exceeds
50 ft or if required by
fireplace manufacturer
Each supplementary
support holds up to
25 ft. of chimney
Maintain 2 in. clearance
from chimney to framing
Figure 8.8
Figure 8.9
J. Supplementary Support & Stabilizer
Install a supplementary support if total chimney height is
greater than 50-feet, or if the replace manufacturer re-
quires it. If additional support is needed, install one or more
supplementary supports which can each support 25-feet of
chimney (Fig. 8.8).
• Clamp the supplementary support band around the pipe
using the nut and bolt provided, and anchor the support
to nearby building framing.
• Always maintain the 2” clearance to combustibles from the
chimney pipe. A stabilizer is available and may be required
by some replace manufacturers to keep the chimney
vertical and help maintain clearances to combustibles
within a chase.
• Clamp the stabilizer to the pipe using the nut and bolt
provided, and secure legs to nearby framing using
plumber’s tape or guy-wires (Fig. 8.9).
Note: The stabilizer does not support the weight of the
chimney, it is only used to keep chimney centered within a
chase.
Heatilator • Birmingham BIR50-B • 4059-682C• 8/12