Vermont Casting DBT36 - Manual (Page 14)

DBT33/DBT36/DBT39 -14- 10002789/0
STEP 6
Use appropriate length of pipe sections - telescopic or xed -
and install the horizontal vent sections. The sections which go
through the wall are packaged with the starter kit, and can be
cut to suit if necessary. (Fig. 26).
Sealing vent pipe and restop gaps with high temperature
sealant will restrict cold air being drawn in around replace.
STEP 7
Apply high temperature sealant to 4" (100 mm) and 7" (175
mm) collars or the termination one inch away from crimped
end. Guide the vent terminations 4" and 7" collars into their
respective vent pipes. Double check that the vent pipes over-
lap the collars by 2" (50 mm). Secure the termination to the
wall with screws provided and caulk around the wall plate
to weatherproof, Fig. 27. As an alternative to screwing the
termination directly to the wall you may also use expanding
plugs or an approved exterior construction adhesive. You may
also attach the termination with screws through the inner body
into the 4" vent pipe however for this method you must extend
the 4" pipe approximately 6" (150 mm) beyond the outer face
of the wall.
Support horizontal pipes every 3' (91 cm) with
metal pipe straps.
Check replace to make sure it is levelled and
properly positioned.
B
ELOW
G
RADE
I
NSTALLATIONS
When it is not possible to meet the required vent terminal
clearances of 12" (305mm) above grade level a snorkel vent
kit is recommended. It allows installation depth of down to
7 " (178mm) below grade level. The 7" is measured from
the centre of the horizontal vent pipe as it penetrates through
the wall.
If venting system is installed below ground, we recommend a
window well with adequate and proper drainage.
Ensure sidewall venting clearances are observed.
If installing a snorkel a minimum 24" vertical rise is necessary.
The maximum horizontal run with the 24" vertical pipe is 36"
(915mm). This measurement is taken from the collar of the
replace (or transition elbow) to the face of the exterior wall.
See the Sidewall Vent Graph for extended horizontal run if the
vertical rise exceeds 24".
1. Establish vent hole through the wall (Fig. 22.
2. Remove soil to a depth of approximately 16" below base
of snorkel. Install drain pipe. Install window well (not
supplied). Rell hole with 12" of coarse gravel leaving a
clearance of approximately 4" below snorkel. (Fig. 28)
3. Install vent system.
4. Ensure a watertight seal is made around the vent pipe
coming through the wall.
5. Apply high temperature sealant caulking (supplied)
around the 4" and 7" snorkel collars.
6. Slide the snorkel into the vent pipes and secure to the
wall.
7. Level the soil so as to maintain a 4" clearance below
snorkel. (Fig. 28)
Fig. 26
Fig. 27