Lochinvar EW150 Installation & Service Manual page 19

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General venting
Failure to properly seal all vent joints
DANGER
and seams may result in flue gas spillage
and carbon monoxide causing severe
personal injury or death.
The connection from the vent to the vent termination
outside the building MUST be made with one of the
specified vent materials and must be direct as possible
with no reduction in diameter. The vent accessories not
otherwise provided, such as firestop spacers, thimbles, caps,
etc., MUST be from the same vent material manufacturer
and installed in accordance with the manufacturers listing.
The vent connection through the sidewall must provide
correct spacing to combustible surfaces. The vent pipe
connection to the sidewall vent cap MUST have a gas-tight
seal to prevent the leakage of flue products.
Figure 2-13 Sidewall Vent Locations
VENT HOOD MUST BE
MOUNTED 4' MIN. AWAY
HORIZONTALLY FROM
DOORS AND WINDOWS
VENT HOOD MUST
BE MOUNTED 1' MIN.
ABOVE DOORS
AND WINDOWS
1' MIN
4' MIN
VENT HOOD
3' MIN
VENT HOOD
3' ABOVE ANY OUTSIDE
AIR INTAKE WITH 10'
1' ABOVE GRADE DIRECT VENT AIR INLET
Venting of Flue Products
Locate appliances as close as possible to the sidewall where
the vent for flue products will be installed.
Horizontal runs must slope upwards not less than 1/4 inch
per foot (21 mm per meter) from the appliance to the vent
terminal. Follow manufacturers instructions.
The vent cap shall terminate at least 3 feet (91 cm) above
any forced air inlet within 10 feet (3.05 m).
The vent shall terminate at least 4 feet (1.22 m) below, 4
feet (1.22 m) horizontally from or 1 foot (30 cm) above any
door, window or gravity air inlet to the building.
The vent system shall terminate at least 1 foot (30 cm) above
grade and above normal snow levels.
(continued)
1' MIN
4' MIN
VENT HOOD MUST BE
MOUNTED AT LEAST
10' FROM INSIDE CORNER
VENT HOOD MUST BE MOUNTED
4' MINIMUM BELOW WINDOWS
Installation & Service Manual
The vent for a direct vent system shall NOT terminate
above public walkways.
The vent shall not be installed closer than 10 feet (3.05 m)
from an inside corner of an L-shaped structure.
Do not terminate the vent in a window well, stairwell,
alcove, courtyard, or other recessed area. The vent can not
terminate below grade.
Flue gas condensate can freeze on exterior walls or on the
vent cap. Frozen condensate on the vent cap can result in
a blocked flue condition. Some discoloration to exterior
building surfaces can be expected.
masonry surfaces should be protected with a rust resistant
sheet metal plate.
The vent cap should have a minimum clearance of 4 feet
(1.22 m) horizontally from and in no case above or below,
unless a 4 foot (1.22 m) horizontal distance is maintained
from electric meters, gas meters, regulators and relief
equipment.
Combustion Air Inlet
Combustion air supply pipes can NOT be combined into a
single pipe for multiple appliance installations.
Combustion air supplied from outdoors must be free of
contaminants (See Combustion and Ventilation Air). To
prevent recirculation of flue products into the combustion
air inlet, follow all instructions in this section.
To help prevent recirculation of flue products:
The combustion air inlet cap MUST NOT be installed
above the flue outlet cap.
The combustion air inlet cap must be installed horizontally
or below the flue outlet and MUST maintain a minimum 3
foot (91 cm) radius clearance from the flue outlet cap.
The combustion air inlet cap and vent cap for flue outlet
MUST be located on the same sidewall and in the same
pressure zone.
The combustion air inlet cap must not be installed closer
than 10 feet (3.05 m) from an inside corner of a L-shaped
structure.
The combustion air inlet cap must be installed at least 1
foot (30 cm) above ground level and above normal snow
levels
Adjacent brick or
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