Common Venting Using Tile-Lined Interior Masonry Chimne
MINIMUM LENGTH = AS SHORT AS PRACTICAL.
FOR MAXIMUM LENGTH SEE NOTE TO LEFT
NOTE- Refer to provided venting tables | J | ||
for installations in the USA and the | |||
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venting tables in current CSA B149 for |
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installations | in Canada. | _ | |
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FU
OTHER
APPLIANCE
_Row
'and Combined Vent Connector
J
INTERIOR TILE=LINED
MASONRY CHIMNEY
NOTE - the chimney must be properly
sized per provided venting tables or lined with listed metal lining system.
PERMANENTLY
SEALED FIREPLACE
OPENING
NOTE - Either
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| FIGURE | 18 |
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| ,IMPORTANT |
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| Never connect a Category I appliance to a chimney that is | ||||||||||||||||||
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| servicing | a | If a fireplace |
| chimney flue | |||||||||||||||
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| is used to vent this appliance, the fireplace opening must | |||||||||||||
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| be permanently | sealed. |
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| A type B or listed chimney lining system that passes | |||||||||||||
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| through an unused masonry chimney flue is not considered | |||||||||||||
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| to be exposed to the outdoors. |
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| General | Venting | Requirements |
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| Vent all G50UH(X) furnaces according to these instruc- | |||||||||||||
A | tions: |
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1 - Vent diameter recommendations and maximum allow- | ||||||||||||||||||||||||||
existing lined masonry chimney if the following conditions | ||||||||||||||||||||||||||
| able piping runs are found in the provided venting tables | |||||||||||||||||||||||||
are met: |
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| for the USA, and the appropriate venting tables in the | ||||||||||||||
• The chimney is currently serving | at least one drafthood |
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| standards of CSA B149 Natural Gas and Propane | |||||||||||||||||||||||||
equipped | appliance |
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| Installation | Codes for Canada. |
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• The vent connectors and chimney are sized accord- |
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2 - | In no case should | the vent or vent connector | diameter | |||||||||||||||||||||||
ing | to the provided | venting tables | for the USA, and | |||||||||||||||||||||||
| be less | than the | diameter | specified | in |
| the | provided | ||||||||||||||||||
the | appropriate | venting | tables | in | the standards | of |
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CSA | B149 | Natural | Gas | and | Propane | Installation |
| venting | tables for the USA, and the appropriate venting | |||||||||||||||||
Codes | in Canada. |
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| tables in the standards | of CSA B149 Natural Gas and | |||||||||||||||
If type B1 |
| Propane | Installation Codes | for Canada. |
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er appliance | can be vented into the chimney. The outer wall | 3 - | Single appliance | vents | ||||||||||||||||||||||
of type B1 vent | pipe must not be exposed | to flue products. |
| chimney | has a larger | diameter or flow | area | than the | ||||||||||||||||||
A type B1 vent or masonry chimney liner shall terminate |
| vent connector, use the vertical vent diameter to de- | ||||||||||||||||||||||||
| termine | the | minimum | vent capacity |
| and | the vent | |||||||||||||||||||
above the roof surface with a listed | cap or a listed roof as- |
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sembly according to the terms of their respective listings |
| connector diameter to determine the maximum vent | ||||||||||||||||||||||||
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and the vent manufacturer's instructions. |
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| capacity, | The flow area of the vertical | vent, | however, | |||||||||||||||||
When inspection reveals that an existing chimney is not |
| shall not exceed 7 times the flow area of the listed ap- | ||||||||||||||||||||||||
| pliance | categorized vent area, drafthood |
| outlet area or | ||||||||||||||||||||||
safe for the intended purpose, | it shall be rebuilt to conform |
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to nationally | recognized | standards, | lined | or | relined | with |
| flue collar area unless designed according | to approved | |||||||||||||||||
suitable | materials, | or replaced | with a gas vent | or chimney |
| engineering | methods. |
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suitable | for venting | G50UH(X) | series units. The chimney | 4 - | Multiple | appliance | vents - The flow area | of the largest | ||||||||||||||||||
passageway | must be checked | periodically to ensure that it |
| section | of vertical | vent | or chimney shall not exceed 7 | |||||||||||||||||||
is clear and free of obstructions. |
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| times the smallest listed appliance categorized vent | |||||||||||||||||||
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Do not install | a manual damper, barometric | draft regulator, |
| area, drafthood outlet area orflue collar area unless de- | ||||||||||||||||||||||
or flue | restrictor | between | the furnace and | the chimney. |
| signed according to approved engineering | methods. |
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