Venting

If the confined space is within a building of tight construction, air for combustion, ventilation, and draft hood dilution must be obtained from outdoors. When directly communicating with the outdoors or communicating with the outdoors through vertical ducts, two permanent openings, located in the above manner, shall be provided. Each opening shall have a free area of not less than one square inch per 4000 Btuh (5.5 cm2/kW) of the total input of all appliances in the enclosure. If horizontal ducts are used, each opening shall have a free area of not less than one square inch per 2000 Btuh (11 cm2/kW) of the total input of all appliances in the enclosure.

(b) CANADIAN INSTALLATIONS

Ventilation of the space occupied by the boiler(s) shall be provided by an opening for ventilation air at the highest practical point communicating with outdoors. The total cross-sectional area shall be at least 10% of the area of the combustion air opening but in no case shall the cross-sectional area be less than 10 square inches (64.5 cm2).

In addition to the above, there shall be permanent air supply opening(s) having a cross-sectional area of not less than 1 square inch per 7,000 BTUH (3.2 cm2/kW) up to and including 1,000,000 BTUH plus 1 square inch per 14,000 BTU (1.6 cm2/kW) in excess of 1,000,000 BTUH. This opening(s) shall be located at, or ducted to, a point neither more than 18" (46.0 cm) nor less than 6 inches (15.2 cm) above the floor level.

Where power vented equipment is used in the same room as the boiler, sufficient air openings must be supplied. UNDERSIZED OPENINGS MAY RESULT IN INSUFFICIENT AIR FOR COMBUSTION.

Where an exhaust fan is installed in the same room with a boiler, sufficient openings for air must be provided in the walls.

UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION. SOOTING MAY RESULT WITH AN INCREASED RISK OF ASPHYXIATION.

CAUTION

WHEN VENTING THE GENESIS BOILER THROUGH AN OVERSIZED CHIMNEY (INCLUDING MASONRY CHIMNEYS), ADDITIONAL CARE MUST BE EXERCISED TO ASSURE PROPER DRAFT. FOR PROPER OPERATION, A MINIMUM DRAFT OF -0.02"

W.C.ANDAMAXIMUM DRAFT OF -0.04" W.C. MUST BE MAINTAINED. IN INSTANCES OF EXCESSIVE DRAFT, A BAROMETRIC DAMPER MAY BE REQUIRED TO ASSIST IN MAINTAINING THE PROPER DRAFT. DRAFT SHOULD BE MEASURED 2 FEET (0.6 M) ABOVE

THE BOILER VENT COLLAR.

WARNING

THE INSTRUCTIONS IN THIS SECTION ON VENTING THE BOILER MUST BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.

This boiler is approved to be vented as a Category I, Category III (horizontal venting), or a Direct Vent appliance. The Horizontal and Direct Venting options require a special vent kit.

STANDARD (VERTICAL) VENTING, CATEGORY I

THIS BOILER MAY BE VENTED ACCORDING TO TABLE 10 (ALSO

SEE FIGURE 6). AT LEAST TYPE B VENTING MUST BE USED WITH THE STANDARD VENTING OPTION (thru-the-roof) USING THE NATIONAL FUEL GAS CODE VENT TABLES. TYPE B VENT PIPE CANNOT BE USED IF THE BOILER IS VENTED HORIZONTALLY OR AS A DIRECT VENT (SEE PAGES 12 THROUGH 15). ALL LOCAL UTILITY, STATE/ PROVINCIAL, REGULATIONS ON VENTING MUST BE FOLLOWED.

VENT SIZING, VENT CONNECTORS, INSTALLATION AND TERMINATION SHALL BE IN ACCORDANCE WITH THE CURRENT EDITION OF NATIONAL FUEL GAS CODE, ANSI Z223.1 OR CAN/ CSA-B149.1 or applicable provisions of the local building codes. Size and install proper size vent pipe; refer to Table 6.

Horizontal runs of vent pipe shall be securely supported by adequately placed (approximately every 4 feet [1.2 m]), noncombustible hangers suitable for the weight and design of the materials employed to prevent sagging and to maintain a minimum upward slope of 1/4" per foot (2 cm/m) from the boiler to the vent terminals. Dampers or other obstructions must not be installed in the vent. Be sure that the vent connector does not extend beyond the inside wall of the chimney.

TABLE 6: VENT CONNECTION

MODEL NUMBER	VENT CONNECTOR
G(B,W) 1000	10" (25.4 cm)
G(B,W) 1300	12" (30.5 cm)
G(B,W) 1500	12" (30.5 cm)
G(B,W) 1850	14" (35.6 cm)
G(B,W) 2100	14" (35.6 cm)
G(B,W) 2500	16" (40.6 cm)

For vent arrangements other than Table 10 and for proper boiler operation, a barometric damper is required to maintain draft between -0.02" W.C.. and -0.04" W.C. at 2 feet (0.6 m) above the boiler vent collar.

STANDARD (HORIZONTAL) VENTING, CATEGORYIII

Vent sizing, installation and termination shall be in accordance with the NATIONAL FUEL GAS CODE, ANSI Z223.1 OR CAN/CSA-B149.1 (Current Editions). If applicable, all local, utility, state/provincial regulations on venting must be followed. See Table 11, Figure 7 for venting specifications. The exhaust vent pipe must be of a type listed for use with Category III gas burning heaters such as "Saf-T-Vent" manufactured by Heat-Fab Inc.

For Category III installations, it is important that the Installed vent be airtight. Please insure that all joints are sealed properly during installation. For Horizontal Vent Kit part numbers, see Table 7.

TABLE 7: HORIZONTAL VENT KITS.

HORIZONTAL VENT KIT	MODEL
211426	G(B,W) 1000
211426-1	G(B,W) 1300
211426-1	G(B,W) 1500
211426-2	G(B,W) 1850
211426-2	G(B,W) 2100
211426-3	G(B,W) 2500

DIRECT VENT VERTICALAND HORIZONTAL VENTING

For direct vent applications, this boiler may be vented according to Tables 12 and 13; see Figures 8 and 9. For category III applications,