Lochinvar COPPER-FIN II CF401 Designer's Manual page 10

Lochinvar
Category I double wall vent (or equivalent)
connectors and sized according to vent
sizing tables (FAN column) in the latest
edition of the National Fuel Gas Code.
The Category I vent and accessories, such as
firestop spacers, thimbles, caps, etc., must
be installed in accordance with the vent
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 an existing building should
be corrected when new equipment is
installed, so the installation conforms to the
latest edition of the National Fuel Gas Code,
ANSI Z223.1.
When resizing any portion of the common
venting system, it should be resized to
approach the minimum size as determined
using the appropriate tables in the National
Fuel Gas Code.
The weight of the venting system must not
rest on the water heater. The venting system
must be adequately supported in
compliance with local codes and other
applicable codes.
8
L o c h i n v a r '
D E S I G N E R S G U I D E C O P P E R
Vent Terminations
The vent terminal should be vertical and
exhaust outside the building at least 2 feet
(0.6m) above the highest point of the roof
when within a 10 foot (3.05m) radius.
Additionally, vertical terminations must be a
minimum of 3 feet (0.9m) above the roof line,
and when less than 10 feet (3.05m) from a
parapet wall must be a minimum of 2 feet
(0.61m) higher than the parapet wall.
Vent caps should have a minimum clearance
of 4 feet (1.2m) horizontally from, and in no
case above or below [unless a 4 feet (1.2m)
horizontal distance is maintained], electric
meters, gas meters, regulators and relief
equipment.
Maintain a distance of at least 3 feet (0.9m)
above any forced air inlet within 10 feet
(3.05m) and a distance of at least 4 feet
(1.2m) below, 4 feet (1.2m) horizontally
from, or 1 foot (30cm) above any door,
window or gravity air inlet.
Do not terminate the vent in a window well,
stairwell, alcove, courtyard or other recessed
area. The vent can not terminate
below grade. The bottom of the vent
terminal shall be located at least 12 inches
(30cm) above grade and clear of snow, ice,
leaves or other debris.
The distance of the vent terminal from
adjacent public walkways, adjacent
buildings, windows, and building openings
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