Vent Termination Below Grade - Vermont Castings SDDVTCBSB Installation & Operating Manual

6. Use appropriate length of pipe sections – telescopic or
fixed – and install. The sections which go through the
wall are packaged with the starter kit, and can be cut to
suit if necessary.
7. Guide the vent terminations 4" and 6-5/8" collars into
their respective vent pipes. Double check that the vent
pipes overlap the collars by 2" (51 mm). Secure the
termination to the wall with screws provided and caulk
around the wall plate to weatherproof. As an alternative
to screwing the termination directly to the wall, you
may also use expanding plugs or an approved exterior
construction adhesive.
Figure 32 - Horizontal Length Requirement
NOTE: Support horizontal pipes every 5' (152 cm) with
metal pipe straps.
Cutout On Vinyl
Termination Cap
Figure 33 - Horizontal Termination Cap on a Vinyl Siding Wall
KT1498
cap on sidingT
21
X
Vinyl Siding Wall
Vermont Castings • Stardance SDDVTSB Installation Manual_R10 • 04/18

Vent Termination Below Grade

Install Snorkel Kit #SLP-SNORK when it is not possible to
meet the required vent termination clearances of 12" (305
mm) above grade level. The snorkel kit will allow installation
depth of down to 7" (178 mm) below grade level. The seven
inches is measured from the center of the horizontal vent
pipe as it penetrates the wall. If the venting system is
installed below grade, a window well must be installed
with adequate and proper drainage. (Figure 35)
NOTE: Be sure to maintain side wall clearances and vent
run restrictions. Figures 3, 4, 5, 6.
1. Establish the vent hole through the wall.
2. Remove soil to a depth of approximately 16" (406 mm)
below the base of the snorkel. Install a window well (not
supplied). Refill the hole with 12" (305 mm) of coarse
gravel and maintain a clearance of at least 4" (102 mm)
below the snorkel. (Figure 35)
3. Install the vent system as described on Pages 16-18.
4. Be sure to make a watertight joint around the vent pipe
joint at the inside and outside wall joints.
5. Apply high temperature sealant around the inner and
outer snorkel collars. Join the pipes and fasten the
snorkel termination to the wall with the screws provided.
6. Level the soil to maintain a 4" clearance below the
snorkel.
7. If the foundation is recessed, use extension brackets
(not supplied) to fasten the lower portion of the snorkel.
Fasten the brackets to the wall first, and then fasten to the
snorkel with self-tapping #8 x 1/2" sheet metal screws.
Extend the vent pipes out as far as the protruding wall
face. (Figure 34)
Recessed Wall
Sheet Metal
Screws and
Bracket
Wall Screws
and Anchors
Waterproof Seal
Around Pipe
Figure 34 - Use extension brackets to mount snorkel against
recessed wall.
ST219
snorkel detail
12/6/99 djt
Firestop
Finishing
Collar
7" Pipe
Wall Plate
3-90-20306760