Installation and Operation Manual TFTN 085-199
Figure 4-5 Venting Below Grade
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 piping MUST be secured to the side of the
building above grade, as shown, to provide rigidity.
4. Ensure that the Exhaust & Air-Intake clearances
are maintained, see Section 5.0 VENT
TERMINATION CLEARANCES.
Figure 4-6 Outdoor Venting
Vent piping outside the building is permitted under the
following conditions:
1. Horizontal piping outside the building cannot exceed
20 ft and shall be sloped back to the boiler a
minimum of ½” per foot.
NOTE: outdoor vent length must be included in the
overall vent length calculation.
2. All normal termination clearances are maintained.
3. The pipe is supported every 24”.
Figure 4-7 Existing Chimney Chase Way
It is permissible to use an existing chimney as a chase
way to run the vent piping if:
1. The chimney is not being used by any other boiler.
2. Flue gases do not enter the vacant chimney.
3. Only certified venting materials are used; see Table
4-3.
4. Vent lengths are within the maximums specified;
see Tables 4-4 & 4-5.
5. The top of the chimney is capped, and the vent
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 air to a TFTN boiler. Failure to follow these instructions will result in fire, property
damage, serious injury or death.
12” plus snow
allowance above grade
Maximum of 20 ft is
permitted for piping
outside of building.
Keep Free of Obstructions
Existing
Chimney (used
as a chase way)
Min. 12 in. above
snow level
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