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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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The vent materials and accessories, such as
firestop spacers, thimbles, caps, etc.,
MUST
be installed in accordance with the
manufacturer’s listing.
The vent connector and firestop
MUST
provide
correct spacing to combustible surfaces and
seal to the vent connector on the upper and
lower sides of each floor or ceiling through
which the vent connector passes.
Any improper operation of the common
venting system in the existing building should
be corrected when new equipment is installed,
so that the installation conforms to the latest
edition of the National Fuel Gas Code, ANSI
Z223.1.
The efficiency of this appliance allows its
products of combustion to be vented through a
smaller vent pipe when compared to units of
the same Btu/hr capacity. For this reason,
resizing common venting systems is
recommended for proper operation.
When resizing any portion of the common
venting system, it should be resized to
approach the minimum size as determined
using the appropriate tables (FAN column) in
the National Fuel Gas Code.
Failure to resize a common venting system
could lead to the formation of condensate and
premature deterioration of the vent material.
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. Adjacent
brick or masonry surfaces should be protected
with a rust resistant sheet
metal plate.
Vent connectors serving appliances vented by
natural draft shall not be connected to
any portion of a mechanical draft system
operating under positive pressure.
Connection to a positive pressure stack may
cause flue products to be discharged into the
living space causing serious health injury.
Locate units as close as possible to a chimney
or gas vent.
VENT TERMINATIONS
When locating the vent cap, consider the
effects of snow, leaf dropping, etc., to insure
that no blockage occurs.
The distance of the vent terminal from adjacent
public walkways, adjacent buildings, windows
that open and building openings
MUST
comply with the latest edition of the National
Fuel Gas Code, ANSI Z223.1.
The vent terminal should be vertical and
exhaust outside the building at least 2 feet
(0.6 m) above the highest point of the roof
within a 10 foot (3.05 m) radius of the
termination.
Lochinvar
IMPORTANT!
The vent cap should
have a minimum
clearance of 4 feet
horizontally from electric
meters, gas meters,
regulators, air inlets and
air relief equipment.
Additionally, the vent
cap should never be
located above or below
these items, unless a 4
foot horizontal distance
is maintained.
