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VENT SYVENT SY
VENT SYVENT SY
VENT SY
STEM MODIFICASTEM MODIFICA
STEM MODIFICASTEM MODIFICA
STEM MODIFICA
TIONTION
TIONTION
TION
When an existing boiler is removed from a common venting system, the common venting
system is likely to be too large for the proper venting of the appliances remained connected
to it. If this situation occurs, the following test procedure must be followed:
REMOVAL OF BOILER FROM VENTING SYSTEMREMOVAL OF BOILER FROM VENTING SYSTEM
REMOVAL OF BOILER FROM VENTING SYSTEMREMOVAL OF BOILER FROM VENTING SYSTEM
REMOVAL OF BOILER FROM VENTING SYSTEM
At the time of removal of an existing boiler, the following steps shall be followed with each
appliance remaining connected to the common venting system placed in operation, while the
other appliances remaining connected to the common venting system are not in operation.
A. Seal an unused opening in the common venting system.
B. Visually inspect the venting system for proper size and horizontal pitch and determine
there is no blockage or restriction, leakage, corrosion and other deficiencies which could
cause an unsafe condition.
C. Insofar as is practical, close all building doors and windows and all doors between the
space in which the appliances remaining connected to the common venting system are
located and other spaces of the building. Turn on clothes dryers and any other appliance not
connected to the common venting system. Turn on any exhaust fans, such as range hoods
and bathroom exhausts, so they operate at maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers.
D. Place in operation the appliance being inspected. Follow the lighting instructions. Adjust
thermostat so appliance will operate continuously.
E. 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.
F. After it has been determined that each appliance remaining connected to a common
venting system properly vents when tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas burning appliances to their previous
condition of use.
G. Any improper operation of the common venting system should be corrected so the
installation conforms with the latest revision of the National Fuel Gas Code, ANSI Z223.1.
When resizing any portion of the common venting system, the common venting system should
be resized to approach the minimum size as determined using the appropriate tables in
appendix G in the latest revision of the National Fuel Gas Code, ANSI Z223.
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