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
In addition to the above, there shall be permanent air supply opening(s) having a
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.
VENTING
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
W.C.ANDAMAXIMUM DRAFT OF
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
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/
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
STANDARD (HORIZONTAL) VENTING, CATEGORYIII
Vent sizing, installation and termination shall be in accordance with the NATIONAL FUEL GAS CODE, ANSI Z223.1 OR
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 | |
G(B,W) 1300 |
| |
G(B,W) 1500 |
| |
G(B,W) 1850 |
| |
G(B,W) 2100 |
| |
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,
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