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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 flush 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 first DM 54 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 firebox smoke dome assembly to the face of the DM 54 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 97).
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 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
