14
240012994 Rev. B [08/31/2020]
5 - COMBUSTION AIR AND VENT PIPING
5.3 Denitions
1.
Coaxial piping – Exhaust and air intake pipe have a
common axis.
2.
Twin Pipe - Exhaust and intake air are separate pipes,
can be terminated using single wall terminals from the
vent manufacturer or eld built conguration using elbows
or tees.
5.2 Removal of Existing Boiler From Common Vent
System
When existing boiler is removed from common venting
system, common venting system is likely to be too large for
proper venting of appliances remaining connected to it.
After removal of existing boiler, following steps shall be
followed with each appliance remaining connected to common
venting system placed in operation, while other appliances
remaining connected to common venting system are not in
operation:
• Seal any unused openings in common venting system.
• Visually inspect venting system for proper size and
horizontal pitch. Determine there is no blockage or
restrictions, leakage, corrosion and other deciencies which
could cause an unsafe condition.
• When practical, close all building doors, windows, and
all doors between space in which appliances remaining
connected to common venting system are located and
other spaces of building. Turn on clothes dryer and any
appliance not connected to common venting system.
Turn on exhaust fans, such as range hoods and bathroom
exhaust so they will operate at maximum speed. Do not
operate summer exhaust fan. Close replace dampers.
• Turn on appliance being inspected. Follow lighting
instructions. Adjust thermostat so appliances will operate
continuously.
• Test for spillage at draft hood relief opening after 5
minutes of main burner operation. Use ame of match or
candle, smoke from cigarette, cigar or pipe.
• Determine each appliance remaining connected to common
venting system properly vents when tested as outlined
above. Then return doors, windows, exhaust fans and any
other gas-burning appliance to their previous condition of
use.
• Any improper operation of common venting system
should be corrected so installation conforms with National
Fuel Code, ANSI Z223.1/NFPA 54 and/or Natural Gas
and Propane Installation Code, CAN/CSA B149.1. When
re-sizing any portion of common venting system, common
venting system should be re-sized to approach minimum
size as determined using appropriate tables in Chapter 13
of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/
or Natural Gas and Propane Installation Code, CAN/CSA
B149.1.
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