A.O. Smith PCG6240T403NOV 100, PCG2J5040T3NOV 100, GAHH 40 100 Connector must be firmly attached

COMBUSTION AIR AND VENT SYSTEM REQUIREMENTS

• The connector must be firmly attached and

sealed to prevent it from falling out.

• To aid in removing the connector, a thimble or

slip joint may be used.

• The connector must not extend beyond the

inner edge of the chimney as it may restrict

The following figures are examples of vent pipe system installations and may or may not be typical for your specific application. Consult the “National Fuel Gas Code”, NFPA 54, ANSI Z223.1-current edition and the guidelines set forth by prevailing local codes.

the space between it and the opposite wall of

the chimney

	3			FT.		2 FT. Minimum Above Any Object
							Within 10 FT. Horizontally
Support Strap	Minimum
Maintain		Seal
Clearance*								Do Not Extend
							Vent Beyond Edge
								Of Chimney
Vent
Connector		Slope			Up
			1/4 Inch
			Per Foot
			Minimum

3 FT.

Minimum

Support Strap

Maintain

Clearance*

Vent

Connector

Slope Up

1/4 Inch

Per Foot

Minimum

2 FT. Minimum Above

Any Object Within

10 FT. Horizontally

Type B Double

Wall Vent Pipe

**Maintain Specified Clearance

Chimney Termination Vent System

Figure 8.

Do not reduce the vent to less than the draft hood outlet diameter. Do not terminate the vent connector in a chimney that has not been certified for this purpose. Some local codes may prohibit the termination of vent connectors in a masonry chimney.

Vertical Exhaust Gas Vent: Vertical exhaust gas vents must be installed with U.L. listed type B vent pipe according to the vent manufacturer’s instructions and the terms of its listing.

It must be connected to the water heater’s draft hood by a listed vent connector or by directly originating at the draft hood opening.

Vertical gas vents must terminate with a listed cap or other roof assembly and be installed according to their manufacturer’s instructions.

Gas vents must be supported to prevent damage, joint separation, and maintain clearances to combustible materials.

IMPORTANT: This gas vent must be terminated in a vertical position to facilitate the removal of the burnt gases.

An unused chimney flue or masonry enclosure may be used as a passageway for the installation of a gas vent. NOTE: The chimney flue or masonry enclosure size may be too large to allow proper venting.

Common (combined) venting is allowable with vertical type B vent systems and lined masonry chimneys as long as proper draft for the water heater is established under all conditions of operation. CAUTION: DO NOT common vent this water heater with any power vented appliance.

Venting Gas Vent System With Type B Double Wall Vent Pipe.

Figure 9.

Consult the table found in the “National Fuel Gas Code”, NFPA 54, ANSI Z223.1-current edition to determine the minimum height from roof to lowest discharge opening.

Listed Vent Cap

Maintain Manufacturer’s

Specified Minimum Clearance

Support Strap						**Maintain
						Specified
Maintain	Seal					Clearance
Clearance*
				Vent Connector
			Vent
	Connector
		Slope Up			Unused Chimney
		1/4 Inch
					Flue Or Masonry
		Per Foot
					Enclosure
		Minimum

Venting Through Chimney With Type B Double Wall Vent Pipe.

Figure 10.

*Maintain vent pipe clearance requirements to local, state and/or the “National Fuel Gas Code”, ANSI Z223.1(NFPA 54)-current edition.

**NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances states that these chimneys are intended to be installed in accordance with the installation instructions provided with each chimney support assembly. Minimum air space clearance to combustible materials should be maintained as marked on the chimney sections.

10