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Discovery I
Thimble
Site constructed for masonry chimney installation:
Components
A minimum length of 12 inches [305mm] (longer for thicker
walls) of solid insulated factory-built chimney length
constructed to UL 103 Type HT 6 inch (152mm) inside
diameter. Chimney needs to extend a minimum of 2 inches
(51mm) from the interior wall and a minimum of 1 inch
(25mm) from the exterior wall.
Wall spacer, trim collar and wall band to fit solid pack
chimney selected.
Minimum 8 inch (203mm) diameter clay liner section (if not
already present in chimney) and refractory mortar.
When jurisdiction requires install approved chimney liner in
masonry chimney.
Air Clearances
•
Masonry chimney clearance must meet NFPA 211
minimum requirement of 2 inches (51mm) to sheet
metal supports and combustibles.
•
Minimum of 1 inch (25mm) clearance around the
chimney connector.
•
Top of wall opening is a minimum of 13-1/2 inches
(343mm) from ceiling or 4-1/2 inches (114mm) below
minimum clearance specified by chimney connector
manufacturer. NFPA 211 minimum vertical clearance of
18 inches (457mm) from chimney connector and ceiling
or minimum recommended by chimney connector
manufacturer (Figure 14.2).
Instructions:
1. Open inside wall at proper height for the chimney
connector to entry the masonry chimney (Figure 14.2).
2. Entry hole to masonry chimney must be lined with
an 8 inch (203mm) minimum diameter clay liner, or
equivalent, secured with refractory mortar.
3. Construct a 17 inch x 17 inch (432mm x 432mm)
outside dimension frame from 2 x 2 framing lumber to
fit into wall opening. Inside opening of frame should
be no less than 14 inch x 14 inch (356mm x 356mm)
(Figure 14.2).
4. Attach the wall spacer to the chimney side of the frame.
5. Nail the frame into the wall opening. The spacer
should be on the chimney side.
6. Insert the section of the solid insulated chimney into the
outer wall of the masonry chimney.
7. Tightly secure the length of the solid insulated chimney
with the wall band to the masonry chimney.
8. Insert a section of chimney connector into the chimney.
Make sure it does not protrude past the edge of the
clay chimney liner inside the chimney.
9. Seal the end of the chimney connector to the clay liner
with refractory mortar.
10. Install trim collar around the sold pack chimney section.
14
Listed Chimney
Ceiling Support
Chimney
Connector
Floor
Protector
Figure 14.1 - Prefabricated Interior Chimney
Minimum18.0"
NFPA 211
17.0" OD
14.0" ID
8.0"
Center of Hole
Thimble
Include depth
of hearth pad
Figure 14.2
7039-174K
Listed Termination Cap
Storm Collar
Flashing
C L
ceiling
13.5" below ceiling to top
of opening
Wall
or top of opening is a min.of
4.5" below min.clearance
specified by connector mfg.
1.5 2x2 framing stud
2.0 min air clearance
1.0 min air clearance
4.5
1.5"
2.0"
2.0"
1.5"
1.0"
C L
1.0"
August 13, 2018
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