41
Structural Support
The STANDARD firebox/smoke dome assembly has
a load capacity that allows for the fireplace system to carry a
limited amount of straight, vertical DM 54 chimney sections.
The load capacity for each model, stated as maximum DM 54
chimney heights, are as follows:
STANDARD Model 36: Max. 57 feet of DM 54
STANDARD Model 42: Max. 64 feet of DM 54
STANDARD Model 46: Max. 72 feet of DM 54
These chimney heights are for straight chimneys (no
offsets) and are exclusive of brickledge.
Important:
DM 54 chimneys taller than the above listed
maximum heights require a steel angle (minimum of
4” x 4” x 3/8”) be set across the STANDARD firebox opening
when assembling the unit as a structural lintel.
This steel lintel shall span the STANDARD firebox
opening, bearing fully on the front 4 inches of the firebox
side wall components. The vertical leg of the angle steel lintel
should turn up and sit in front of the STANDARD damper
plate component. (Figures 72 & 73)
Important:
The application of the steel angle as described
above is also required in all STANDARD installations where
the brickledge is used.
This required steel lintel placement is in addition to
the reinforcing required for DM 54 chimneys with brickledge
as described on page 37.
Important:
For DM 54 chimneys with both offsets and a
brickledge it is important to fully support the last offset block
where the chimney returns to vertical. This is required in order
to provide complete vertical support for the brickledge and its
related loads.
Important:
When placing steel angles or any other steel
support members into the STANDARD fireplace structure
maintain a 2” minimum air space around steel members for
clearance to combustible members and combustible surfaces.
FIGURE 73
FIGURE 74
FIGURE 72
