Install Instructions

44
However, boiler may be installed with
vertical venting and sidewall combustion air
inlet or visa versa, if installation conditions
do not allow alternate arrangement.
10. If the vent passes through interior spaces
in oors above the boiler room, enclose the
vent with material having a re resistance
rating at least equal to the rating of the
adjoining oor or ceiling. Maintain minimum
clearances to combustible materials
between the enclosure and the vent.
11. Provide permanent seal around annular
spaces where vent pipe and combustion
air intake pipe penetrate outside walls to
prevent entry of combustion products into
building.
12. Use appropriate designed thimbles when
passing through combustible walls (thimble
use is optional for noncombustible walls).
Ensure thimble is sealed to prevent moisture
from entering structure.
Figure B-2: Approved Terminal Locations
13.
Protect building materials from degradation
from ue gases or ue gas condensate.
14. Vent-Air Intake system may be installed
through wall 3" - 24" thick.
Planning Vertical Installations –
1. Install re stop where vent and air intake
passes through oors, ceilings or framed
walls. The re stop must close the opening
between the vent and/or air intake pipe and
the structure.
2. Size roof opening to allow easy insertion of
vent and air intake piping to allow proper
installation of ashing and storm collar to
prevent moisture from entering the structure
3. Use appropriately designed vent ashing
when passing through roofs. Follow ashing
manufacturers’ instructions for procedures.
4. Ensure there is a weather-tight seal between
the vent and/or air intake piping were it
penetrates the storm collar and roof ashing.
APPENDIX B2 – Direct Venting (continued)