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c. For horizontal sidewall terminations, maintain
at least 6 pipe diameters minimum horizontal
distance between any adjacent individual
vent terminations. Additional horizontal
spacing between any adjacent individual vent
terminations as well as extending the distance
from building surfaces to vent termination
end are recommended to avoid frost damage
to building surfaces where vent terminations
are placed.
d. Multiple individual vertical vent pipes may be
piped through a common conduit or chase so
that one roof penetration may be made.
e. For vertical roof terminations, maintain at
least 6 pipe diameters minimum horizontal
distance between adjacent individual
appliance vent terminations.
2. Combustion Air Piping
a. M u l t i p l e a p p l i a n c e c o m b u st i o n a i r
terminations are shown in Figure 11.
b. Each individual appliance must have its own
combustion air pipe and terminal when using
category IV venting.
c. Individual appliance sidewall terminals must
be placed at least 12 in. (300 mm) [18 in. (460
mm) in Canada] above the ground plus the
expected snow accumulation.
d. Do not exceed the maximum combustion
air pipe length for an individual appliance as
listed in Table 4.
WARNING
WARNING
Moisture and ice may form on the surface around
vent termination.
To prevent deterioration, surface must be in good
repair (sealed, painted, etc.).
Do not allow low spots in the vent where condensate
may pool.
Use specified vent and combustion air pipe
diameters.
All vent and combustion air piping must be sealed
and airtight.
Alteration of the appliance vent connection is
prohibited.
30
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
NOTICE
NOTICE
The joint between the terminal and the last piece of
pipe must be outside of the building.
WARNING
WARNING
The vent for this appliance shall not terminate:
1. Over public walkways; or
2. Near soffit vents or crawl space vents or other areas
where condensate or vapor could create a nuisance
or hazard or cause property damage; or
3. Where condensate vapor could cause damage or
could be detrimental to the operation of regulators,
relief valves, or other equipment.
e. If possible, locate the vent and combustion
air terminals for each appliance on the same
wall to prevent nuisance shutdowns. If not,
each appliance may be installed with a roof
vent terminal and sidewall combustion air
terminal.
G. Terminal Installation
1. Use the terminal connections supplied by the
venting manufacturer. Follow manufacturer's
instructions to attach the terminal to the vent
system.
2. For PVC/CPVC terminals, apply a heavy bead of
silicone to the male end of the terminal before
inserting it into the last piece of pipe. Orient
the terminal so that the seam in the terminal
is at 12:00. Smooth the silicone over the seam
between the terminal and the last piece of
pipe, applying additional silicone if necessary to
ensure a tight seal. Allow the silicone to cure per
the silicone manufacturer's instructions before
operating the appliance.
3. Install Bird/Rodent screens in the terminals.
Use a screen having 1/2 in. x 1/2 in. (13 mm x
13 mm) mesh.
4. Adhere to the minimum and maximum wall
thickness specified by the manufacturer of the
wall penetration assembly.
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