19
Save These Instructions
Vermont Castings • Aspen 1920 Owner's Manual_R32 • 08/17
Figure 5.9
- Wall Pass-through with ventilated steel thimble.
ST275
wall with
ventilated
steel thimble
24 ga. Sheet
Steel Supports
24 ga. Sheet
Steel Supports
2” (51mm) Min.
Chimney clearance to sheet steel
supports and combustibles
2” (51mm)
Min.
Chimney Flue
2” (51mm) Min.
air space
Prefab
Chimney
Section
Prefab Chimney
Section
Chimney
Connector
Masonry Chimney
constructed to NFPA 211
Figure 5.8
- Wall Pass-through using single wall chimney connector
with a ventilated steel thimble.
ST274
single wall
w/ventilated thimble
12/99
Min. 6”
(152mm)
Chimney clearance to sheet
steel supports and combustibles
2” (51mm) Min.
Glass Fiber
Insulation
Chimney Connector
Chimney Flue
Steel Thimble
with two
1” (25mm) Ventilated
Channels
Masonry Chimney
constructed to NFPA 211
24 ga. Sheet
Steel Supports
Figure 5.10
- CSA approved Wall Pass-through.
ST276
CSA approved wall
pass-through
12/99
24 ga. Sheet
Steel Support
24 ga. Sheet
Steel Support
(one side only)
Min. 18”
(460mm)
Chimney clearance to sheet steel
supports and combustibles
2” (51mm)
Min.
Chimney Flue
Chimney
Connector
Masonry Chimney constructed
to CAN/CSA-B365
Min. 18”
(460mm)
Figure 5.7
- Wall Pass-through using factory-built insulated chimney
section.
ST273
nfpa
factory built insulated
chimney section
12/99
Min. 9”
(230mm)
Air Space
Min. 9”
230mm
Chimney Flue
Sheet Steel
Supports
Min. 2” (51mm)
Non-soluble
refractory cement
Solid insulated, listed factory-built
chimney length set flush with flue
Chimney
Connector
Masonry
Chimney
constructed
to NFPA 211
24 ga. Sheet
Steel Supports
Canadian Requirements:
In Canada, the Canadian Standards Association has
established specific guidelines regarding wall pass-though
design. Figure 5.10 shows one approved method in which
all combustible material in the wall is cut away to provide
the required 18” (457 mm) clearance around the connector.
The resulting space must remain empty. A flush-mounted
sheet metal cover may be used on one side only. If covers
must be used on both sides, each cover must be mounted
on noncombustible spacers at least 1” (25 mm) clear of the
wall. Your local dealer or your local building inspector can
provide details of other approved methods of passing a
chimney connector through a combustible wall.
In Canada, this type of installation must conform to CAN/
CSA-B365, Installation Code for Solid Fuel Burning
Appliances and Equipment.
Alternate methods approved by the NFPA:
• Using a section of double-wall chimney with a 9” (229
mm) clearance to combustibles. (Figure 5.7)
• Placing a chimney connector pipe inside a steel double-
wall ventilated thimble, which is then separated from
combustibles by 6” (152 mm) of fiberglass insulating
material. (Figure 5.8)
• Placing a chimney connector pipe inside a section of 9”
(229 mm) diameter, solid-insulated, factory-built chimney,
with two inches of air space between the chimney section
and combustibles. (Figure 5.9)
