FireRock 3620 Avenue C, Product Manual

Page: 106 / 124

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3. Mount Anchor Plate: Chimneys for
masonry fireplaces begin with an Anchor Plate.
Important: be sure the surface of the masonry
chimney has a level surface on which to attach
the Anchor plate. If the top of the masonry
does not have a level surface, then you will
need to modify the masonry accordingly.
Center the Anchor plate over the masonry
flue opening, and seal the Anchor Plate with
a high-temperature sealant. Secure Anchor
plate with (4) 2” x 1/4” masonry anchors (Fig.
2).
4. Attach Chimney: Attach the first Chimney
Section onto the Anchor plate by using the
sheet metal screws provided. Always maintain
at least a 2-inch clearance to combustibles.
The 2-inch clearance is an air space; do not
fill that clearance space with any materials. If
an offset is required, refer to the Elbow Offset
Installation Section below.
5. Frame Openings: From the ceiling, drop a
plumb bob to the center of the fireplace’s flue
outlet and mark this center point on the ceiling.
Mark appropriate cutting lines around the
center point. Cut a square hole in the ceiling.
Frame a level, square opening centered over
the hole that you have cut. Frame openings at
each floor level above the Fireplace (Fig 3).
These openings are to hold the Firestop and
Attic Insulation Shield. Locate each opening by
dropping a plumb bob to the four corners of the
opening below. Maintain the minimum 2-inch
clearance/air-space. Maintain the minimum
Table 1
Diameter Framing Dimension
10"
17" x 17"
12"
19" x 19"
14"
21" x 21"
16"
23" x 23"
Figure 2
MASONRY
ANCHORS
HI-TEMP
SEALANT
FIREPLACE
ANCHOR PLATE
FIRESTOP
SQUARE FRAME
CHIMNEY
FIRESTOP
ATTIC INSULATION
CHIMNEY SECTION
CHASE TOP STORM
TERMINATION
SHIELD & COLLAR
CAP
COLLAR
SQUARE FRAME
FLASHING
(4) ROOF
RADIATION
SHIELDS
Figure 3
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