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29
• For a venting system that extends through
any zone above that on which the connected
appliance is located (except for one and two
family dwellings), the vent system shall be
enclosed with an enclosure having a fi re
resistance rating equal to or greater than that of
the fl oor or roof assemblies through which it
passes.
• Design any enclosure to permit inspection of the
system.
• Do not place any type of insulation in any
required clearance spaces surrounding the vent
system.
6. Vertical Installation Requirements:
a. Seal weather exposed joints of the outer jacket
with foil tape or an exterior grade silicone
sealant.
b. The vent system must terminate at least 3 feet
above the roof line and at least 2 feet higher than
any portion of the building within 10 feet.
c. When terminated at a height of more than 6 feet
the stack must be supported by a support bracing.
The vent should be supported every 10 feet.
d. The total continuous distance of the vent system
from the appliance fl ue collar to the termination
shall not exceed that specifi ed in the appliance
manufacturer’s installation instructions.
e. In cold climates do not install a condensate drain
on the exterior of the building. Doing so may
result in dangerous icy conditions on surfaces
near the drain and may cause damage to the vent
system and/or the building exterior.
f. Install supports every 10 feet vertically along the
vent pipe route. Vertical supports are required
after every transition to vertical and are required
after every offset elbow. When the vent is free
standing and penetrates a roof/ceiling another
means of support must be used at a second
location. Refer to the Vertical Supports section
in this manual.