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NOT IN HORIZONTAL SECTION
FURNACE
PIPE DIAMETER
TRANSITION IN
VERTICAL SECTION
A93034
Fig.
Table
LOCATION |
| CLEARANCE (FT) | |
U.S.A. |
| Canada | |
|
| ||
Above grade level or aboveanticipated snow depth | 1 |
| 1† |
Dryer/Water heater ventt | 3 |
| 3 |
From plumbing vent stack | 3 |
| 3 |
From any mechanical fresh air intake | See note 4 |
| 6 |
For furnaces with an input capacity of100,000 Btuh or |
|
|
|
mechanical air supply (windows or doorswhich can be opened) or | 1 |
| 1 |
opening |
|
|
|
For furnaces with an input capacity greaterthan 100,000 Btuh or |
|
|
|
mechanical air supply (windows or doorswhich can be opened) or | 1 |
| 3 |
opening |
|
|
|
From service regulator vent, electric and gas meters and relief equipment | 4* |
| 6‡ |
Above grade when adjacent to public walkway | Note 3 |
| Note 3 |
* Horizontal distance.
†18 in. above roof surface in Canada.
‡ 36 in. to electric meter in Canada only.
NOTES:
1.If installing 2 adjacent 355MAV furnaces, refer to Multiventing and Vent Terminations section for proper vent configurations.
2.When locating
3.Vent termination can not terminate less than 2 ft horizontal and 7 ft above public walkway or where condensate vapor or droplets may be a hazard.
4.Vent termination must be at least 3 feet above any forced draft inlets within 10 feet horizontal. Vent termination must be at least 3 feet horizontal from other direct vent appliances intake unless otherwise specified by manufacturer.
Other gas appliances with their own venting system may also use the abandoned chimney as a raceway providing it is permitted by local code, the current edition of the National Fuel Gas Code and the vent or liner manufacturer’s installation instructions. Care must be taken to prevent the exhaust gases from one appliance from contaminating the combustion air of other gas appliances.
CAUTION: When vent pipe is exposed to temperatures below freezing, such as when it passes through an unheated space or when a chimney is used as a raceway, pipe must be insulated as shown in Table 8 with