Vent pipe system, Draft hood installation – A.O. Smith Water Heater User Manual

Page 13

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GABLE VENT

TO OUTDOORS

INSTALL ABOVE

INSULATION

^ OUTLET

AIR TO

ATTIC 1 SO.

INCH PER

4000 BTUH

1 SO. INCH PER

4000 BTUH

OPEN

FOUNDATION-

VENT

ALL AIR FROM OUTDOORS: INLET AIR FROM VENTILATED

CRAWL SPACE/OUTLET AIR TO VENTILATED ATTIC

FIGURE 6.

ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC

FIGURE 7.

so.

INCH PER

2000 BTUH

ALL AIR FROM OUTDOORS USING HORIZONTAL DUCTS

CONFINED

SPACE

ALTERNATIVI
OPENING
LOCATION

1 SO. INCH

PER 3000 BTUH

ALL AIR FROM OUTDOORS - USING A SINGLE PERMANENT OPENING

FIGURE 8B.

Vent Pipe System

This water heater uses a non-direct, single-pipe vent
system to remove exhaust gases created by the burning of
fossil fuels. Air for combustion is taken from the immediate
water heater location or is ducted in from the outside (see
“Combustion Air Supply and Ventilation”).

This water heater must be properly vented for the removal
of exhaust gases to the outside atmosphere. Correct

installation of the vent pipe system is mandatory for the
proper and efficient operation of this water heater and is
an important factor in the life of the unit.

The vent pipe must be installed according to all local and
state codes or, in the absence of local and state codes, the
“National Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current
edition. The vent pipe installation must not be obstructed
so as to prevent the removal of exhaust gases to the
outside atmosphere.

IMPORTANT: The use of vent dampers is not
recommended by the manufacturer of this water heater.

Although some vent dampers are certified by CSA

International, this certification applies to the vent damper

device only and does not mean they are certified for use
on this water heater.
U.L. recognized fuel gas and carbon monoxide (CO)
detectors are recommended in all applications and should
be installed using the manufacturer’s instructions and local
codes, rules, or regulations.

IMPORTANT: If you lack the necessary skills required

to properly install this venting system, you should not

proceed, but get help from a qualified technician.

Draft Hood Installation

INSTALL THE DRAFT HOOD WITH
THE FOUR SCREWS PROVIDED.

FIGURE 8A.

FIGURE 9