GOLD CGi
3a Venting — general information
CGi venting methods — Chimney draft or Direct exhaust
Chimney draft venting
Chimney draft venting uses the natural draft provided by a vertical vent or chimney. Category I appliance (non- positive vent static pressure and vent gas temperature that avoids excessive condensate production in vent). See Section 3b. Chimney draft installations use:
1.Vent connector (single or doublewall) sized to eliminate positive pressure in vent system. Diameter increases immediately at boiler.
2.Doublewall metal vent
Direct exhaust — vertical or sidewall
Direct exhaust venting uses inside combustion air with no combustion air connector piping. All CGi flue gas vents are pressurized, requiring careful sealing of all joints. Category III appliance (positive vent static pres- sure and vent gas temperature that avoids excessive condensate production in vent). See pages
Direct exhaust installations use:
1.Vent pipe specified in this manual.
2.Vent termination through outside wall, roof or un- used chimney. Tight chimney areas will make vent joint construction very difficult.
3b
Table 3
Vent connector diameter
Figure 7
Chimnney
draft
venting
Venting — chimney draft venting
Inspect existing chimney before installing boiler. Failure to clean or replace perforated pipe or lining will cause severe personal injury or death.
Vent sizing given in Table 3 is only a general guideline. The vent connector and chimney must be designed, sized and constructed in compliance with all applicable codes. Failure to correctly size and install the vent system could result in severe personal injury, death or substantial property damage.
1.Use doublewall metal vent
2.To prevent downdrafts, chimney should extend at least 3 feet above the highest point where it passes through a roof and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet.
3.To vent with another appliance, see National Fuel Gas Code, ANSI
4.Do not connect breeching to any portion of a mechanical draft system that can operate under positive pressure.
5.Maintain minimum 2”clearance from combustible materials to vent pipe.
6.Do not use chimney with an open fireplace.
7.Make horizontal runs as short as possible. Long runs can cause condensation.
8.When longer runs are used, support pipe with appropriate hangers.
9.To prevent blockage, do not vent into bottom of chimney.
10.Vent pipe must not go beyond inside wall of chimney.
11.Vent passing through floors or ceilings must be fire- stopped.
12.See Figure 7 and Table 3 to connect boiler to venting sys- tem.
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