Definitions - Dunkirk DMG-240 Installation, Operation & Maintenance Manual

• 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 flame 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.
6 - COMBUSTION AIR AND VENT PIPING

6.3 Definitions

1.
Coaxial piping – Figure 6-1 exhaust and air intake pipe
have a common axis.
2.
Twin Pipe – Figure 6-2 Exhaust and intake air are
separate pipes, can be terminated using single wall
terminals from the vent manufacturer or field built
configuration using elbows or tees.
20
P/N 240011656, Rev. E [07/30/2018]