Vent Horizontal Wall Thimble Installation
Inner Thimble | Outer Thimble |
Section | Section |
Side View
An approved 4 inch (10 cm) Vent Horizontal Wall Thimble must be used.
The Wall Thimble requires mechanical support from the wall sufficient to support any incidental loads on the system. If the wall is not sufficient enough to support the Wall Thimble, then appropriate additional framing and/or blocking is required.
more caulking.
Use 4 hollow wall anchors, at least 1/8” (.32 cm) in diameter and of appropriate length for the thickness of the sheathing, if sheathing is particle board or other composite material. Use
4
Inner Wall
Outer Thimble
Inner Thimble 
Section
Section
90° Elbow
Vent
Pipe
Outer | 90° termination |
Wall | with screen |
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Caulk for
weather seal
Water
Heater
O
u
tside
Wall
Mounting
Brackets
Side View
WARNING: Use UL approved Category III vent material only. No other vent material is permitted.
CAUTION: Follow the vent manufacturers installation instructions as design might vary from manufacturer to manufacturer.
INSTALLATION PROCEDURE: Prepare an opening for the Wall Thimble in the wall. The opening must be
If there are not sufficient support members to secure the Wall Thimble or if there is a semirigid foam insulation layer under the sheathing, appropriate fasteners must be used to secure the Wall Thimble to the support members.
The Wall Thimble is designed to adapt to any wall thickness from
Select the larger diameter half of the Wall Thimble for the outside of the wall.
●Apply a continuous bead of high quality silicone or silicone/latex caulk on the inside of the outer flange. This will be the only weather seal to keep moisture outside the building. Ensure a sufficient seal is made.
●Position this portion of the Wall Thimble into the prepared hole from the outside. Secure the assembly into the prepared opening using fasteners as indicated by sheathing or structural members, sealing the screw heads with
through solid masonry walls. Reinstall the decorative sheathing around the Wall Thimble. This assembly may be painted to match the exterior decor.
●Attach a screened 4 inch (10 cm) termination fitting to the female end of a vent section or slip connector. Use the method described in the Venting installation instructions (page 13). Slide the vent in through the outside of the Thimble and seal the annular space with a thick bead of caulk.
●Slide the interior portion of the Thimble into the inside hole. Be certain the interior and exterior Thimble halves overlap at least 1” (2.5 cm). If insufficient overlap exists, extend the interior portion with single wall galvanized pipe.
●Secure the Wall Thimble to the interior sheathing using suitable fasteners.
●Secure the vent section or slip connector that protrudes through the Wall Thimble to the rest of the vent system as described in the Venting installation instructions (page 13).
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3” (8 cm) Clearance |
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1/4” per foot upward slope
3” (8 cm) Clearance 
3’ |
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(91 cm) |
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Condensate Hanger | |||
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| Trap | ||
Vent |
| To Drain. Dispose of | |
| condensate in accordance | ||
Adapter | to local codes | ||
Typical Horizontal Termination | Typical Horizontal Termination | 17 |
w/ ¼” per foot DOWNWARD Slope | w/ ¼” per foot UPWARD Slope |
