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VII. Venting (continued)
I. Multiple Appliance Terminations
1. Vent Piping Terminations
a. Multiple appliance vent terminations are shown
in Figure 12.
b. Each individual appliance must have its own
vent pipe and vent terminal unless a common
venting system is used following the guidlines
of the "Engineered Venting Method" section in
this manual.
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. Multiple appliance combustion air terminations
are shown in Figure 12.
b. Each individual appliance must have its own
combustion air pipe and terminal when using
category IV venting.
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 con-
densate 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.
AMP 400-1000L I&O Manual
WARNING
WARNING
The joint between the terminal and the last
piece of pipe must be outside of the building.
The vent for this appliance shall not terminate:
1. Over public walkways; or
2. Near soffit vents or crawl space vents or oth-
er areas where condensate or vapor could
create a nuisance or hazard or cause property
damage; or
3. Where condensate vapor could cause dam-
age or could be detrimental to the operation
of regulators, pressure relief valves, or other
equipment.
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 6.
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.
J. 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.
27
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