55
Structural Information
The MAGNUM 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:
MAGNUM Model 36: Max. 57 feet of DM 54
MAGNUM Model 42: Max. 64 feet of DM 54
MAGNUM Model 48: 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 MAGNUM firebox opening
when assembling the unit as a structural lintel.
This steel lintel shall span the MAGNUM 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 MAGNUM damper plate
component. (Figures 113 & 114)
Important:
The application of the steel angle as described
above is also required in all MAGNUM 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 50.
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 MAGNUM fireplace structure maintain a
2” minimum air space around steel members for clearance to
combustible members and combustible surfaces.
Wind Load Calculations:
Using Earthcore Mortar to connect
the DM chimney system, the maximum un-reinforced height
above the roof line of a one story residence with an exposure
classification C:
90 MPH
26’-0”
100
MPH 24’-0”
110
MPH 21’-8”
120
MPH 19’-8”
130
MPH 18’-0”
140
MPH 17’-6”
146
MPH 16’-8”
150
MPH
16’-4”
For two story residences, please call the Technical Department
at: 800-642-2920.
FIGURE 114
FIGURE 115
FIGURE 113
FRONT DAMPER
SUPPORT
CAST IRON
DAMPER
PARTS
SMOKEDOME
END
FRONT
REAR
END
STEEL
ANGLE
