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6
VICTORY
A
PPENDIX A
Removal Of Existing Boiler From Common Vent System
"At the time of removal of an existing boiler, the following
s
teps shall be followed with each appliance remaining con-
nected to the common venting system placed in operation,
while the other appliances remaining connected to the com-
mon venting system are not in operation."
(a)Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies
w
hich could cause an unsafe condition.
(b)Insofar as is practical, close all building doors and win-
dows and all doors between the space in which the appli-
ances remaining connected to the common venting sys-
tem are located and other spaces of the building. Turn on
clothes dryers and any appliance not connected to the
common venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they will oper-
ate at maximum speed. DO NOT operate a summer
exhaust fan. Close fireplace dampers.
(c)Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance
will operate continuously.
(d)Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle, or smoke from a cigarette, cigar or pipe.
(e)After it has been determined that each appliance remain-
ing connected to the common venting system properly
vents when tested as outlined above, return doors, win-
dows, exhaust fans, fireplace dampers and any other gas-
burning appliance to their previous conditions
of use.
(f) Any improper operation of the common venting system
should be corrected so the installation conforms with the
National Fuel Gas Code, ANSI Z223.1-latest edition.
When resizing any portion of the common venting sys-
tem, the common venting system should be resized to
approach the minimum size as determined using the
appropriate tables in part 11 in the National Fuel Gas
Code, ANSI Z223.1-latest edition.
A
PPENDIX B
Vent System Location and Condensation
D
rain Requirements
1
. The venting system shall terminate at least 3 feet above
any forced air inlet located within 10 feet.
2. The venting system shall terminate at least 4 feet below,
4 feet horizontally from, or 1 foot above any door, window
or gravity air inlet into any building. The bottom of the
vent terminal shall be at least 12 inches above grade
or the nor
mal snow level, whichever is greater.
3
. Through the wall vents for Category II and IV appliances
shall not terminate over public walkways or over areas
where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of regula-
tors, relief valves or other equipment. Minimum clearance
of 4' horizontally from, and in no case above or below,
unless a 4' horizontal distance is maintained, from electric
meters, gas meters, regulators and relief equipment.
Where local experience indicates that condensate may be
a problem with Category I and III appliances, this provi-
sion shall also apply.
4. Provision shall be made to collect and dispose of conden-
sate from venting systems serving Category I, II, III and
IV appliances.
Caution
Flue gases exiting from the vent terminal will condense.
Building materials in the area of the vent terminal should be
protected from discoloration and degradation.