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Figure 4.3: Venting with Vent Damper in Horizontal Position

C. VENT PIPING AND CHIMNEY

1. Install vent piping in accordance with Venting of

Equipment part of the

National Fuel Gas Code

, ANSI

Z223.1/NFPA 54, sections 7.2, 7.3 or 7.4 of
CAN/CSA B149.1,

Natural Gas and Propane

Installation Code

, or applicable provisions of the

local building codes.

2. Inspect the existing chimney and lining for structural

soundness, corrosion and perforations. Repair as
necessary.

3. Install vent pipe to slope upward at least 1/4

″

per

lineal foot (21 mm per meter) between the draft
hood outlet and the chimney.

4. Before connection of joints, inspect the vent pipe

interior for foreign objects such as tools, equipment,
rags, etc. and remove if present.

5. Insert vent pipe into but not beyond the inside wall

of the chimney flue.

6. Do not connect vent connectors serving appliances

vented by natural draft into any portion of
mechanical draft systems operating under positive
pressure.

7. Support horizontal portions of the venting system to

prevent sagging by use of metal strapping or
equivalent means. Locate supports at no more than
4 foot (1.2 meter) intervals.

D. BOILER REMOVAL FROM COMMON

VENTING SYSTEM

At the time of removal of an existing boiler, follow these
steps 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 any unused openings 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 any clothes dryers and any
appliance not connected to common venting system.
Turn on any exhaust fans, such as range hoods and
bathroom exhausts, so they will 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 the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and
any other gas-burning appliance to their previous
conditions of use.

g. Any improper operation of the common venting

system should be corrected so that the installation
conforms with the current edition of the

National

Fuel Gas Code

, ANSI Z223.1/NFPA 54 and/or

CAN/CSA B149.1,

Natural Gas and Propane

Installation Code

. 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 the

National Fuel Gas Code

, ANSI Z223.1/NFPA 54