Lochinvar EW 150, Designer'S Manual

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The vertical termination MUST be a minimum
of 3 feet (0.9 m) above the point of exit in the
rooftop.
A vertical termination less than 10 feet
(3.05 m) from a parapet wall MUST be a
minimum of 2 feet (0.6 m) higher than the
parapet wall
.
The vent cap shall terminate at least 3 feet
(0.9 m) above any forced air inlet within 10
feet (3.05 m). The vent shall terminate at least
4 feet (1.2 m) below, 4 feet (1.2 m)
horizontally from or 1 foot (0.30 m) above
any door, window, or gravity air inlet to the
building.
Do not terminate the vent in a window well, stairwell,
alcove, courtyard, or other recessed area. The vent
cannot terminate below grade.
MASONRY CHIMNEY
A masonry chimney MUST be properly sized
for the installation of a high efficiency gas fired
appliance. Venting of a high efficiency
appliance into a cold or oversized masonry
chimney can result in operational and safety
problems.
Exterior masonry chimneys, with one or more
sides exposed to cold outdoor
temperatures, are more likely to have
venting problems. For this reason, exterior
masonry chimneys are not generally
recommended to vent high efficiency gas
appliances.
An interior masonry chimney, which is not
exposed to the outdoors below the roofline,
may be used to vent high efficiency gas
appliances based on the results of careful
inspection, proper sizing and local code
approval. If there is any doubt about the sizing
or condition of a masonry chimney, it MUST
be relined with a properly sized and approved
chimney liner system.
An interior masonry chimney MUST be
carefully inspected to determine its suitability
for the venting of flue products.
A clay tile lined chimney MUST be structurally
sound, straight and free of misaligned tile,
gaps between liner sections, missing sections
of liner or any signs of condensate drainage at
the breeching or clean out. If there is any
doubt about the condition of a masonry
chimney, it MUST be relined.
Metallic liner systems (Type “B” double-wall,
flexible, or rigid metallic liners) are
recommended to line or reline an existing
masonry chimney. Consult with local code
officials to determine code requirements or
the advisability of using a lined masonry
chimney or relining of a masonry chimney.
L o c h i n v a r
D E S I G N E R
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S G U I D E E F F I C I E N C Y
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W A T E R H E A T E R
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7
NOTE:
An unlined masonry
chimney MUST NOT be
used to vent flue
products from this high
efficiency appliance.