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DM 54 Chimney System: Offset Block (cont.)
With straight chimneys the front of the DM 54 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 ush with the room side face of smoke dome assembly
while the DM 54 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 rst DM 54 outer casing block ush to the
back end of this offset block. This will leave a distance of 6-3/4”
from the face of the MAGNUM rebox smoke dome assembly to
the face of the DM 54 outer casing block. This allows for the smoke
dome to sit ush with the inside face of the 2” by 6” wall and the
straight chimney to run up the outside of the wall. (Figure 97).
For a wall thickness of 9”, nominal 8” CMU plus 1-1/2”
furring strip - rst 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 54 outer casing once the
outer casing block is set in position. (Figure 99)
Greater offset distances can be accomplished by building
with more offset chimney blocks. (Figure 98)
FIGURE 97
FIGURE 98
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