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LIGHTWEIGHT BLOCK-IN - SPECIFICATIONS (Cont.)
Factory-Built Chimney (Continued)
Using Offsets
Offsets can be used to align the
chimney and to gain clearance
to combustibles. When using
offsets, make sure to follow all of
the specifications below.
A system can have no more
than a total of 2 offsets (Four 30
degree elbows). Each offset
elbow must be used with a
return elbow. A system using
one offset is allowed to have a
maximum of 8' of inclined
chimney between the elbows.
For every 6' of inclined chimney
a flue support is needed (See
parts list). For systems
incorporating two offsets there is
a maximum of 4' allowed
between each set of offsets
(See the illustration to the right).
Chimney must be totally
enclosed when passing
through living space with a
minimum 2" clearance to
combustibles.
Chimney Adapter
Page 19
Firestop
Firestop
4' Max.
Max. of 30
degrees
2"
Min.
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