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Explorer 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 fi t 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 mini-
mum requirement of 2 inches (51mm) to sheet metal sup-
ports and combustibles.
• Minimum of 1 inch (25mm) clearance around the chim-
ney 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 specifi ed by chimney connector
manufacturer. NFPA 211 minimum vertical clearance of
18 inches (457mm) from chimney connector and ceiling
or minimum recommended by chimney connector manu-
facturer. Figure 12.1
Instructions:
1. Open inside wall at proper height for the chimney con-
nector to entry the masonry chimney. Figure 12.1
2. Entry hole to masonry chimney must be lined with an 8
inch (203mm) minimum diameter clay liner, or equiva-
lent, 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 fi t into wall
opening. Inside opening of frame should be no less than
14 inch x 14 inch (356mm x 356mm). Figure 12.1
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.
12
Minimum18.0"
NFPA 211
17.0" OD
14.0" ID
8.0"
Center of Hole
Thimble
Include depth
of hearth pad
Figure 12.1
Solid Pack Chimney with Metal Supports as a Thimble
Trim Collar
Chimney Section
with 2 inch
(51mm)
Clearance to
Combustibles
Figure 12.2
Fire Risk.
Do NOT pack insulation or other combustibles between
spacers.
•
ALWAYS maintain specifi ed clearances around vent-
ing and spacers.
•
Install spacers as specifi ed.
Failure to keep insulation or other material away from vent pipe
may cause fi re.
7062-197B
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"
Fire Clay Flue
with Airspace
Wall Spacer
Wall Band to
Secure Chimney
Chimney
Wood Studs Used
Connector
for Framing - Spaced
2 inch (51mm)
clearance from
Masonry Chimney
WARNING
February 8, 2016
1.0"
C L
1.0"
Liner
Masonry
Chimney
Section
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