22
FIGURE 28
Assembly Instructions - 60” (cont.)
FIGURE 29
FIGURE 30
FIGURE 31
FIGURE 32
Step 5: Continue stacking the remaining three courses of
back wall. Be sure to reverse the positions of the 38-1/2”
M67 and the 22-1/4” M67 in each successive course.In this
way, the butt joint where the two M67 components meet are
staggered from course to course.
The overall width dimension at the back of the
rebox should be 73-1/2” including the sidewalls.
(Figure 29).
Step 6: Steel angle 4” x 6” x 5/16”, one required,
73-1/2” long which must span the top of the MAGNUM
Model 60 rebox opening.
This steel angle sits on top of the uppermost side
wall component with the four inch leg in the horizontal po-
sition. To avoid a thickness problem with the placement of
the steel angle it is necessary to cut a notch in the top Side
wall component where the angle is to sit. This notch should
be cut approximately 5/16” deep. The notch should start at
the front face of the side wall component (at both the left
and right hand walls) and run to a point 4” back toward the
rebox (Figure 30).
The steel angle sits in this notch. The six inch leg
of the steel angle is in the vertical position and is to be lo-
cated in alignment with the front of the rebox. The ends of
the steel angle should not protrude beyond the outer rebox
side walls (Figure 30).
Mortar between the steel and the notch in the top of the side
wall is not needed.
Step 7: Damper support (front & rear), Part M69, four
required, to be eld cut to t.
Bevel cut one end of each of two M69 damper sup-
ports to 35-1/2” in length from the long point of the bevel
cut to the un-cut square end. (Figure 31). The long point of
the bevel cut is to be at the top of the damper Support
For best results a 15˚ bevel angle is suggested.
Step 8: Bevel cut one end each of two M69 damper sup-
ports to 38” with the long point of the bevel at the bottom
of the damper support. The bevel angle must be at the same
angle – in this case, 15 degrees - to match with the bevel
angle of the other damper supports already cut in Step 7
(Figure 32).
Step 9: Set the cut damper supports along the front and
along the rear of the rebox using one of each of the cut
pieces (one with the long point at the top of the piece and
one with the long point at the bottom of the piece) together
as pairs.
The damper support pair at the front of the rebox
opening will be mortared together and set into the steel
angle from Step 6 (Figure 33).
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