Martin Fireplaces 400BWBIA - Manual (Page 20)

20 61D0008
Rise
6'
(Maximum Offset)
ELBOW INSTALLATION
(CONTINUED)
3. The number of elbows per chimney allowed are as follows:
If the total height of the fireplace and chimney is 13' 6"
or more, two (2) elbows may be used.
If the total height of the fireplace and chimney is 20' or
more, four (4) elbows may be used.
4. Inclined portions of chimney is often used as storage.
Enclose the inclined portions of chimney that pass through
living spaces to avoid contact with and possible damage
to chimney. Maintain minimum air space of 2" between
chimney and enclosing. See Figures 22 and 23.
CHIIMNEY INSTALLATION
Figure 22 - Installing Chimney with Total Height of
Fireplace and Chimney 13' or More
Figure 23 - Installing Chimney with Total
Height of Fireplace and Chimney 20' or More
Continue Chimney to
Proper Height and
Install Round
Chimney Cap or
Chimney
Housing
Center Line
Storm Collar
Flashing
Roof
Center Line
SF Firestop Spacer
— 2" min. Air
Space Clearance to
Combustibles
SF Firestop Spacer
2" min. Air Space
Clearance to
Combustibles
Vertical Chimney
Enclosure
Support Straps
Support
Straps
Note: Two (2)
elbows may be
used when total
installation height
is more than 13'.
Vertical Chimney
Enclosure
Note: Chimney
must be enclosed
in accessible
areas
Support Straps
Note: Do not let support
straps penetrate firestop
Note: Vertical
chimney enclosure
is recommend.
Diagonal chimney
enclosure is
acceptable.
Diagonal
Chimney
Enclosure
Support Strap
5. The length of inclined portion of chimney between elbows must not exceed 6' if elbows are not supported.
The length of inclined portion of chimney between elbows must not exceed 20' if elbows are supported every 6' with
metal support straps.
6. When enclosing the elbows and inclined portions of the chimney, enclosing materials must be installed vertically to
maintain the required 2"minimum air space clearance to the chimney at the extremities of the offset. It is best that enclos-
ing material not follow inclined portions of chimney.
Note: Four (4) elbows may be used when total installation
height is more than 20'. Four (4) is the maximum number of
elbows allowed.