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UBXC-UDXC-IOM (01-24) 1042980-0
INSTALLATION—CONTINUED
General Requirements for Vent Connections—Continued
Vent Terminal Requirements
⚠ DANGER ⚠
• Do not enclose the vent pipe or place it closer than 6 inches (152 mm) to combustible material.
• To prevent combustion products from entering the occupied space, all vent terminations must
be positioned or located away from fresh air intakes, doors, and windows. Failure to comply
could result in severe personal injury or death and/or property damage.
• Consider local snow depth conditions. The vent must be at least 6 inches (152 mm) above the
anticipated snow depth.
⚠ WARNING ⚠
• A different style vent cap could cause nuisance problems or unsafe conditions. The vent cap
must be the same size as the vent pipe.
• Do not locate a vent termination where it may cause hazardous frost or ice accumulations on
adjacent property surfaces.
• Maintain the required clearance from the wall to the vent terminal cap for stability under wind
conditions and to protect the building.
⚠ CAUTION ⚠
Products of combustion can cause discoloration of some building finishes and deterioration of
masonry materials. Applying a clear silicone sealant that is normally used to protect concrete
driveways can protect masonry materials. If discoloration is an esthetic problem, relocate the
vent or install a vertical vent.
• For Category I vents:
a. Where the vent extends through the roof, a clearance thimble is required when the flue pipe extends through
combustible materials. Follow the requirements of the double-wall pipe manufacturer.
b. Maintain a 6-inch (152-mm) clearance between a single-wall vent pipe and combustibles.
c. For Type B double-wall vent pipe, follow the pipe manufacturer’s recommendations for clearance to combustibles.
• Vertical vents must terminate a minimum horizontal and vertical distance from roof lines and adjacent walls or
obstructions. These minimum distances are outlined as follows (based on National Fuel Gas Code requirements
for vents with diameters less than 12 inches):
a. For double-wall vent pipe and a horizontal distance to any vertical wall or similar obstruction of 8 feet or greater,
the vent must terminate above the roof in accordance with Figure 9 and Table 10.
b. For double wall vent pipe and a horizontal distance to any vertical wall or similar obstruction of less than 8 feet,
the vent must terminate at least 2 feet above the highest point where it passes through a roof of a building and
at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet (refer to Table 10).
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