
38
Venting and Combustion Air Installation
Thimble
Box
Outside End Cap
Attach to outer wall
with combustion air inlet
openings facing downward
using galvanized screws
Split Ring
may be used
to provide
addition seal
T
ermination Hood - must vent horizontally - attach to Outside End Cap
3" to 4" reducer
combustion
air inlet piping
Inside End Cap
Apply high temp.
silicon bead to seal
around vent pipe
Note:
Use Locking Bands
inside the
Thimble Box
against the inside and
outside End Caps to prevent
movement of the vent piping.
Thimble
Box
Split Ring
may be used
to provide
addition seal
3" to 4" reducer
combustion
air inlet piping
Inside End Cap
Apply high temp.
silicon bead to seal
around vent pipe
V
ent Piping
extend through thimble box
to termination fitting
T
ermination T
e
e
- must vent horizontally
- must extend a minimum 6" beyond
Outside End Cap. DO NOT
extend
more than 12"
V
ent Piping
extend through thimble box
to termination fitting
Split
Ring
Note:
Use Locking Bands
inside the
Thimble Box
against the inside and
outside End Caps to prevent
movement of the vent piping.
Split
Ring
Outside End Cap
Attach to outer wall
with combustion air inlet
openings facing downward
using galvanized screws
Fig. 25:
Horizontal
W
all
Thimble Kit -
T
ermination Hood
Fig. 26:
Horizontal
W
all
Thimble Kit -
T
ermination
T
ee