Slant/Fin CHS-399 - Manual (Page 24)

Slant Fin Corp. │ Installation and Operation Instructions CHS Series
24
Figure 4-7 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/Air-inlet piping MUST be secured to
the side of the building above grade, as shown,
to provide rigidity.
4. Optional mounting bracket PN. 82075 for
securing the exhaust pipes (only applicable for
3” PVC/CPVC venting).
5. Ensure that the Vent/Air-inlet clearances are
maintained, see Section 5.0 for details.
Figure 4-8 Outdoor Venting
Vent piping outside the building is permitted under
the following conditions:
1. The maximum length outside the building is 20
feet [6.1 m]. 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” [610 mm].
4. The exhaust and air-inlet are sloped back to the
boiler ½” elevation for every linear foot [13 mm
for every linear 305 mm].
Figure 4-9 Existing Chimney Chase Way
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 don’t enter the vacant chimney.
3. Only CHS certified venting materials are used,
see Section 4.0.
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.
Air-Inlet
Existing
Chimney
(used as a
chase way)
Chimney
Cap
Exhaust Vent
Exhaust Vent Min.
18” [457 mm]
above air-inlet
Air-Inlet
Min. 12” [305 mm]
above roof and
snow level
Supports every
24” [610 mm]
12” [305 mm] plus snow
allowance above grade
Air-Inlet
Maximum of 20 ft
[6.1 m] is permitted
for piping outside a
building.
Exhaust
Vent
Gas Vent Directly Below
Keep Free of Obstructions
Exhaust
Air-inlet
Wall Brackets