42
DM Chimney System: Offset Block (cont.)
With straight chimneys the front of the DM outer
casing block sits approximately three and three-quarters inch
(3- 3/4”) back from the front of the smoke dome. This allows
for a nominal 4” thick wall to be flush with the room side face
of smoke dome assembly while the DM chimney passes up the
backside of the wall.
For a nominal 2” by 6” wall thickness the chimney
can be offset 3” rearward.
Set the first DM outer casing block flush to the back
end of this offset block. This will leave a distance of 6-3/4”
from the face of the Magnum 86072 firebox smoke dome
assembly to the face of the DM outer casing block. This allows
for the smoke dome to sit flush with the inside face of the 2”
by 6” wall and the straight chimney to run up the outside of the
wall. (Figure 86).
For a wall thickness of 9”, nominal 8” CMU plus
1-1/2” furring strip - first set two offset chimney blocks in
sequence, rearward. This leaves a distance of 9-3/4” from the
front face of the smoke dome to the front face of the DM outer
casing once the outer casing block is set in position. (Figure
88)
Greater offset distances can be accomplished by
building with more offset chimney blocks. (Figure 87)
FIGURE 86
FIGURE 87
FIGURE 88
Summary of Contents for Magnum 86072-60
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