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1. Install vent piping in accordance with Part 7. Venting
of Equipment, National Fuel Gas Code, ANSI
Z223. I/NFPA 54 or applicable provisions of the local
building codes.
2. Inspect the existing chimney and lining for structural
soundness, corrosion and perforations. Repair as
neces_Fy.
3. Install vent pipe to slope upward at least I/4" per
lineal foot between the draft hood outlet and the
chimney.
4.
5.
6.
7.
Before connection of joints, inspect the vent pipe
interior for foreign objects such as tools, equipment,
rags, etc. and remove if present.
Insert vent pipe into but not beyond the inside wall
of the chimney flue.
Do not connect vent connectors serving appliances
vented by natural draft into any portion of
mechanical draft systems operating under positive
pressure.
Support horizontal portions of the venting system to
prevent sagging by use of metal strapping or
equivalent means. Locate supports at no more than
four (4) foot intervals.
SLOPE uP
A MINIMUM
OF 1/4"
PER FOOT
VENT
DAMP
DRAFT _ _
f¢3
HOOD
RELIEF
flVENT TO
CHIMNEY
SUPPORT
AS REQUIRED,
DRAFT HOOD
OUTLET
Figure 13: Venting with Vent Damper in Vertical Position
SLOPE UP VENT
A MINIMUM DAMPER
OF I/4"
PER FOOT_,,_
_VENT TO
CHIMNEY
11 O'CLOCK i O'CLOCK
POSITION POSITION
!
SUPPORT AS
REQUIRED
r i
HEAT
_CONDENSATION
ZONE
7 O'CLOCK _5 O'CLOCK
POSITION POSIT'ON
DO NOT MOUNT DAMPER
OPERATOR IN SHADED REGION
SECTION A
Figure 14: Venting with Vent Damper in Horizontal Position
11
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