DuraVent Type B Gas Vent - Manual (Page 4)

4
GENERAL INFORMATION
Type B Gas Vents are for venting listed natural
Gas or Liquid propane category I appliances
only. The appliances listed below typically
(but not always) use Type B vent systems.
Boilers
Furnaces
Water Heaters
unit Heaters
Room Heaters
Duct Furnaces
Floor Furnaces
Decorative Gas appliances
DuraVent Type B Vent Systems may be used
on other gas-burning appliances, provided
the manufacturer of the appliance states in
their installation instructions that Type B-vent
is acceptable. Do not use Type B Vents
for category II, III, or IV gas appliances.
Type B Vent shall not be used to vent flue
products from incinerators, combination gas/
oil appliances, oil-fired, or wood-burning
appliances. If there is a question about the
use of Type B Vents, contact the appliance
manufacturer or DuraVent’s Engineering
Department for further information.
PLANNING
1. Appliances. carefully review the appliance
manufacturer’s installation instructions for
positioning the unit, any special venting or
connector requirements, and verify that it is
a category I appliance or an appliance that
requires the use of Type B gas vent.
2. Placement. The placement of the vent
and fittings must be in accordance with Local
codes, as well as accepted venting practices.
If more than one appliance is to be connected
to one venting system, the common vent must
be correctly sized. It is a good idea to make
a sketch of the proposed installation, labelling
the components you will need. adjustable pipe
Lengths are available to make up odd lengths.
Minimize the number of turns and lateral
runs, as the national Fuel Gas code places
limitations on these. a 45° turn is preferable to
a 90° turn. The appliance reference material
should be consulted at this time, as well as any
Local authority having jurisdiction. In most
localities, building permits are required for any
new appliances, or modifications to existing
venting systems.
3. Figures 1, 2, & 3 show examples of some
typical residential installations.
4. Clearance to Combustibles. A 1-inch
clearance (air space) to combustible
materials must be maintained, when using
DuraVent Round B-Vent, regardless of the
pipe diameter.
5. Combustion Air. Refer to appliance
installation instructions and local building
codes to ensure compliance with required
volume of combustion air for each appliance
installed .
6. Slope. If the venting system contains
lateral (horizontal) components, they shall be
positioned so they have an upwards slope
away from the appliance of not less than
1/4-inch rise per foot of run. (Horizontal
vent installed in attics, unconditioned area, or
between floors have further restrictions, please
consult your local building codes for specific
limitations.)
7. Termination Area. Examine the area where
the vent system will terminate. The height of
the termination above the roof is determined
by the roof pitch, and also it’s proximity to
adjacent walls or obstructions. consult Table
2 for proper termination height requirements.
Vent pipe with 3”-12” diameter must terminate
ROUND B VENT