COMBUSTION AIR AND VENT SYSTEM REQUIREMENTS
| 1 SQ. INCH PER |
| 2000 BTUH |
| 100 SQ. INCH |
| MINIMUM (EACH) |
CONFINED | OUTLET |
SPACE |
|
| OUTDOOR |
| AIR DUCTS |
| INLET |
1 SQ. INCH PER
2000 BTUH 100 SQ. INCH MINIMUM (EACH)
ALL AIR FROM OUTDOORS USING HORIZONTAL DUCTS
Figure 6.
ALTERNATIVE
OPENING
LOCATION
CONFINED | 1 SQ. INCH | |
PER 3000 BTUH | ||
SPACE | ||
100 SQ. INCH | ||
| MINIMUM (EACH) |
ALL AIR FROM OUTDOORS - USING A SINGLE PERMANENT OPENING
Figure 7.
Vent Pipe System: 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
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.
Vent Pipe Size: It is important that you follow the guidelines in these instructions for sizing a vent pipe system. If a transition to a larger vent size is required, the vent transition connection must be made at the draft hood outlet. DO NOT reduce the vent size to less than the draft hood outlet diameter.
Vent Connectors:
1.Type B, Double wall, U.L. Listed Vent Pipe.
2.Single wall Vent Pipe.
Maintain the manufacturer’s specified minimum clearance from combustible materials when using type B double wall vent pipe.
Vent connectors made of type B, double wall vent pipe material may pass through walls or partitions constructed of combustible material if the minimum listed clearance is maintained. Maintain a one inch minimum clearance from all combustible materials when using single wall vent pipe.
IMPORTANT: Single wall vent pipe cannot be used for water heaters located in attics and may not pass through attic spaces, crawl spaces or any confined or inaccessible location. A single wall metal vent connector cannot pass through any interior wall.
When installing a vent connector, please note the following
•Install the vent connector avoiding unnecessary bends, which create resistance to the flow of vent gases.
•Install without dips or sags with an upward slope of at least
•Joints must be fastened by sheet metal screws or other approved means. It must be supported to maintain clearances and prevent separation of joints and damage.
•The length of the vent connector cannot exceed 75% of the vertical vent height.
•The vent connector must be accessible for cleaning, inspection, and replacement.
•Vent connectors cannot pass through any ceiling, floor, firewall, or fire partition.
•It is recommended (but not mandatory) that a minimum 12 inches of vertical vent pipe be installed on the draft hood prior to any elbow in the vent system.
IMPORTANT: Existing vent systems must be inspected for obstructions, corrosion, and proper installation.
Chimney Connection: IMPORTANT: Before connecting a gas vent to a chimney, make sure the chimney passageway is clear and free of obstructions. The chimney must be cleaned if previously used for venting solid fuel appliances or fireplaces. Also consult local and state codes for proper chimney sizing and application or, in the absence of local and state codes, the “National Fuel Gas Code”, ANSI Z223.1(NFPA
•The connector must be installed above the extreme bottom of the chimney to prevent potentially blocking the flue gases.
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