VENT PIPING
These furnaces have been classified as
NOTE:
If desired, a side wall termination can be accomplished through the use of an
NOTE: When the downflow furnace is vented through the left side of the furnace cabinet using the provided cutout, Type B vent piping must be used.
The furnace shall be connected to a factory built chim- ney or vent complying with a recognized standard, or a masonry or concrete chimney lined with a lining mate- rial acceptable to the authority having jurisdiction.
▲! WARNING
Furnace venting into an unlined masonry chimney or concrete chimney is prohibited.
Failure to follow this warning could result in property damage, personal injury, or death.
VENTING INTO A MASONRY CHIMNEY
If the chimney is oversized, the liner is inadequate, or
INTERNAL MASONRY CHIMNEYS
Venting of fan assisted appliances into a lined, internal masonry chimney is allowed only if it is common vented with at least one natural draft appliance; OR, if the chimney is lined with type “B”, double wall vent or suit- able flexible liner material (See Table 7).
▲! WARNING
The chimney liner must be thoroughly inspected to in- sure no cracks or other potential areas for flue gas leaks are present in the liner. Liner leaks will result in early deterioration of the chimney.
Failure to follow this warning could result in carbon monoxide poisoning or death.
Installer’s Guide
NOTE:
The following section does not apply if BAYVENT800B (Masonry Chimney Vent Kit) is used. All instructions with the kit must be followed.
TABLE 7
MASONRY CHIMNEY VENTING
| Tile Lined Chimney | Chimney Lining | |||
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| Flexible | |
Type Furnace | Internal | External | “B” Vent | Metal Liner | |
Single Fan | No | No | Yes | *Yes | |
Assist | |||||
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Fan Assist |
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| |
+ | No | No | Yes | *Yes | |
Fan Assist |
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| |
Fan Assist |
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| |
+ | Yes | No | Yes | *Yes | |
Natural |
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*Flexible chimney liner size is determined by using the type “B” vent size for the available BTUH input, then reducing the maximum capacity by 20% (multiply maximum capacity times 0.80). The minimum capacity is the same as shown in the “B” vent tables.
External Masonry Chimney
Venting of fan assisted appliances into external chim- neys (one or more walls exposed to outdoor tempera- tures), requires the chimney be lined with type “B”, double wall vent or suitable flexible chimney liner ma- terial. This applies in all combinations of common vent- ing as well as for fan assisted appliances vented alone.
▲! WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation instructions for the venting system being placed into operation could re- sult in carbon monoxide poisoning or death.
The following installation practices are recommended to minimize corrosion caused by condensation of flue prod- ucts in the furnace and flue gas system.
1.Avoid an excessive number of bends.
2.Horizontal runs should pitch upward at least 1/4" per foot.
3.Horizontal runs should be as short as possible.
4.All vent pipe or connectors should be securely sup- ported and must be inserted into, but not beyond the inside wall at the chimney vent.
5.When vent connections must pass through walls or partitions of combustible material, a thimble must be used and installed according to local codes.
6.Vent pipe through the roof should be extended to a height determined by National Fuel Gas Code or local codes. It should be capped properly to prevent rain water from entering the vent. Roof exit should be waterproofed.
7.Use type “B” double wall vent when vent pipe is routed through cool spaces (below 60° F.).
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