For Installations That Exit The Wall Below Grade; Outdoor Venting; Existing Chimney Chase Way - NTI FTV110 Installation And Operation Manual

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General Venting

For installations that exit the wall below grade:

1. Excavate site to a point below where the pipes
are to exit as shown.
2. Ensure the wall is fully sealed where the pipes
penetrate.
3. The Vent/Air-inlet piping MUST be secured to
the side of the building above grade, as shown,
to provide rigidity.
4. Ensure that the Vent/Air-inlet clearances are
maintained, see Section 5.0 for details.
Vent piping outside the building is permitted under
the following conditions:
1. The maximum length outside the building is 20 ft.
Note that outdoor length must be included in the
overall vent length calculation.
2. All normal termination clearances are maintained.
3. The pipe is supported every 24 in..
4. The exhaust and inlet are sloped back to the boiler
½ in. elevation for every linear foot.
It is permissible to use an existing chimney as a chase
way to run the Vent/Air-inlet piping as long as:
1. The chimney is not being used by any other
boiler.
2. Flue gases do not enter the vacant chimney.
3. Only FTV certified venting materials are used,
see Table 4-2.
4. Vent lengths are within the maximums specified.
5. The top of the chimney is capped and the
Vent/Air-inlet pipes are flashed to prevent
leakage into the vacant chimney.
Under no circumstances may an existing chimney or chase-way be used to vent or
provide combustion intake air to a FTV. Failure to follow these instructions will result in
fire, property damage, serious injury or death.
24
Figure 4-8 Venting Below Grade
Figure 4-9 Outdoor Venting
12 in. [305 mm] plus snow
allowance above grade
Figure 4-10 Existing Chimney Chase Way
Chimney
Cap
Existing
Chimney
(used as a
chase way)
Exhaust
Air-inlet
Wall Brackets
Gas Vent Directly Below
Keep Free of Obstructions
Supports every
24 in. [610 mm]
Exhaust
Vent
Air-Inlet
Exhaust Vent
Air-Inlet
FTV I&O Manual
Maximum of 20 ft.
[6.1 m] is permitted
for piping outside a
building.
Exhaust Vent Min.
18 in. above air-
inlet
Air-Inlet
Min. 12 in. above
roof and snow level