A.O. Smith GAHH-50, GAHH-40, 315456-002 Vent Pipe System, Draft Hood Installation

Confined Space

Alternative

Air Inlet

1 sq. in. per

4000 BTUH

Gable Vent to Outdoors

Install Above Insulation

Outlet Air

to the Attic 1 sq. in. per 4000 BTUH

Inlet Air from the Crawl Space

Open

Foundation

Vent

Alternative

Opening

Location

Confined

Space

1 sq. in. per

3000 BTUH

All Air From Outdoors - Using A Single Permanent Opening

FIGURE 8B.

Vent Pipe System

All Air From Outdoors: Inlet Air From Ventilated

Crawl Space/Outlet Air To Ventilated Attic

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

Confined Space

FIGURE 6.

Gable Vent to Outdoors

Install Above Insulation

Outlet Air to the Attic 1 sq. in. per 4000 BTUH

Inlet Air Duct 1 sq. in. per 4000 BTUH

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

12” Max.

All Air from Outdoors Through Ventilated Attic

FIGURE 7.

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.

Confined Space

1 sq. in. per

2000 BTUH

Outlet

Outdoor

Air Ducts

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

Inlet

1 sq. in. per

2000 BTUH

All Air From Outdoors Using Horizontal Ducts

FIGURE 8A.

	Sheet Metal Screws (Four Provided)
	Legs	Draft Hood
		Legs
Slot		Slot
		Jacket Top

Install The Draft Hood With The Four Screws Provided.

FIGURE 9

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