DuraVent Type B Gas Vent - Manual (Page 17)

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to obtain a specific location for the appliance.
Make a mark on the horizontal pipe Section
flush with the vertical face of the masonry, for
referencing the vertical position. Slip a pipe
collar over the horizontal pipe Section and
install the remaining fittings as shown in Figure
30. a minimum of 12 inches of connector rise
is required.
(i). Insulation. pull the pipe collar towards
the 90° Elbow. Fill in the gap between the
masonry and the horizontal pipe Section with
ceramic fiber insulation, as shown in Figure
31. The filling may be faced off with grout, if
desired. push the pipe collar back flush with
the masonry. Make any final adjustments
on the adjustable Length pipe (if used), and
tighten the clamping bolts.
TROUBLESHOOTING
1. Purpose. This section is intended as a
general maintenance and troubleshooting
guide, and as such, cannot encompass all
configurations or vent designs. For problems
encountered which are beyond the scope
of this sheet, contact your DuraVent Dealer,
Distributor, or DuraVent’s Engineering
Department. It is imperative that the one-
inch clearance (air space) defined in these
instructions be maintained. In most cases,
a one-inch minimum clearance must be
maintained to combustibles. The only
exceptions are 4-inch, 5-inch and 6-inch Oval
B-vent which are installed within stud walls.
Oval B-vent and BW Vent are the subject of
a separate section of these instructions For
Oval B-vent,, the clearances are established
by the listed Firestop Spacers described in the
instructions for Oval B-Vent.
2. Appliance. Read the appliance installation
instructions carefully, ensuring that the
prescribed clearances are met, and that it is a
category I appliance.
3. Spillage. Spillage from an appliance draft
hood may cause condensation on windows, or
odors that the occupant may notice. Spillage
may be caused by an incorrectly sized vent
system, blockage of the vent system, or a
downdraft in the vent. Other causes are:
excessive lateral runs, too many elbows,
improper pitch to lateral runs (a minimum of
1/4 inch per foot of run is correct), fans or
ventilation systems in the same general area
as the gas appliance, or wind conditions at the
vent cap.
4. Blockage. check the system for blockage
by removing the cap, and looking down into
the vent with a flashlight. check for bird nests,
debris, rodents, insects, or other obstructions.
If nothing is found, inspect the entire system
for physical damage.
5. Downdraft. Downdrafts are generally
caused by the system’s termination being too
close to an adjacent wall, parapet, or other
structure. If the cap is within eight feet of such
an obstruction, it must also be at least two feet
above it. also ensure that the top is at the
height prescribed for your roof pitch in Table
2. Inadequate combustion air is also a major
cause of downdraft problems. appliances like
clothes dryers or other exhausting appliances
in the same utility room can cause downdraft
problems.
6. Condensate/Corrosion. continuous
condensate can cause corrosion (rusting) of
vents, tops, appliance draft hoods, and other
components of the system, as well as the
inside of the appliance. This situation can be
extremely dangerous, and corrective action
must be taken immediately. common causes
of corrosion are listed below: If in doubt call a
professional to inspect the vent.
(a) If the vent system is located in an area
where spray cans or solvents are used
extensively, (laundry areas, or paint shops,