Справочник Пользователя для Vermont Casting SDDVRBS

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Wall 
Thimble 
Shield

Seal with RTV 
Silicone Sealant 
on Exterior side 
here (around 
perimeter)

Wall Thimble 
Shield

Wall 
Thimble 
Face 
Plate

Wall Thimble 
Face Plate

ST930

Fig. 43  Wall thimble.

a Vinyl Siding Standoff (VS) must be installed prior to 
installing the horizontal termination. Refer to the appli-
ance manufacturer to determine if one is recommend-
ed. Attach the vinyl siding standoff to the exterior side 
of the wall (making sure it is level and centered with 
respect to the opening) with screws (provided) at each 
corner of the standoff. Attach the horizontal termination 
to the standoff. (Fig. 45)
If the wall is brick or concrete, and contains no com-
bustible material, a 7” (178 mm) round penetration 
hole is adequate. The wall thimble is not required. The 
perforated straps of the horizontal termination provide 
a method of attachment. These can either be threaded 
through the opening or wall thimble (if used) and 
screwed to the pipe or removed with a pair of tin snips 
if not used. Use proper masonry fasteners to attach the 
horizontal termination to the wall.
7.  If a wall thimble is used, push the pipe (which is 
connected to the appliance) carefully through the wall 
thimble until the DIRECT-TEMP pipe becomes fully 
engaged with the horizontal termination. If no thimble is 
used, place the Trim Plate (TP) on the DIRECT-TEMP 
pipe. Carefully push the DIRECT-TEMP pipe through 

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Horizontal Termination

ST931

Fig. 44  Horizontal termination.

ST932
Selkirk standoff
6/07

Vinyl Siding Standoff

ST932

Horizontal Termination

Fig. 45  Vinyl siding standoff and horizontal termination.

the wall until fully engaged with the horizontal termina-
tion. Secure the trim plate to the wall.
NOTE: If a vertical rise is necessary on the exterior side 
of the building, a 14” (356 mm) and 36” (914 mm) Snor-
kel Termination (ST) is available. Follow the installation 
procedures for horizontal terminations. If the snorkel 
termination is to be located below grade, a window well 
is recommended with adequate and proper drainage 
as per local codes. Leave 2” (51 mm) clearance be-
low snorkel to prevent water from entering the snorkel 
termination. Do not enclose the snorkel within a wall or 
other type of enclosure and do not back fill. Ensure 
that grade level slopes away from the building. (Fig. 42)

 (Fig. 46)

1.  Determine the location of the appliance. Choose 
a location which provides adequate clearance from 
obstacles such as electrical wiring, conduit, framing 
members, plumbing pipe, etc.
2.  After positioning the appliance, determine where the 
vent pipe will pass through the ceiling. This can be done 
by using a plum bob or a small weight attached to a 
string. Hold the plum bob from the ceiling moving it until 
it lines up with the centerline of the outlet of the appli-
ance. Mark the position on the ceiling.
NOTE: Frame openings to the dimensions specified 
in the framing table for the cathedral ceiling support 
box (CCS), the ceiling support (SC) and wherever the 
firestop spacer (FS) is being used.
3.  Cut and frame the appropriate sized square hole 
through the ceiling. Repeat the process for other ceiling 
penetrations as necessary.
4.  Determine and mark the roof penetration in the 
same manner.
5.  Cut a hole in the roof at this point large enough to 
satisfy all clearance-to-combustible requirements as 
specified by the appliance manufacturer’s installation 
instructions.