Oil Furnace Installation Manual
Table Of Contents
506793-02B Page 7 of 16Issue 1810
1. Local building codes may have more stringent
installation requirements and should be consulted
before installation of the unit.
2. The ue pipe should be as short as possible to do the
job.
3. The internal diameter of the ue pipe or vent connector
shall equal the outlet diameter of the ue opening of
the appliance. If the ue vent collar is larger or smaller
than the ue pipe, a gradual transition piece shall be
used and the system shall be tested to ensure that
adequate draft is provided.
4. Single wall ue pipe should not run outside or through
any unconditioned space.
5. Chimney ue shall extend at least 3’ above the highest
point at which the chimney comes in contact with the
roof and not less than 2’ above the highest roof surface
or structure within 10’ of the chimney on a horizontal
plane perpendicular to the chimney. Not more than
4” of chimney ue above the chimney cap shall be
considered in computing this height.
6. The ue pipe must not pass through a oor or ceiling.
Clearances to single wall ue pipe should be no less
than specied in the Clearances section.
7. The ue pipe may pass through a wall where provisions
have been made for a thimble as specied in the
Standards of the National Board of Fire Underwriters
(see Figure 5).
Figure 5. Wall Thimble
8. The ue pipe should slope upward toward the chimney
on a horizontal run of at least 1/4” per foot and should
be supported by something other than the furnace
(see Figure 6 and Figure 7).
9. Extend the ue pipe into the chimney so that it is ush
with the inside of the ue liner. Seal the joint between
the pipe and the liner.
10. The furnace shall be connected to a factory-built
chimney or vent complying with a recognized standard,
or a masonry or concrete chimney lined with a lining
material acceptable to the authority having jurisdiction.
Figure 6. Factory-Built Chimney
Front Flue
Rear Flue
* Barometric control may be installed in either the vertical or
horizontal section of the ue pipe within 18” of the ue outlet of
the furnace.
11. When two or more appliances vent into a common
ue, the area of the common ue should not be less
than the area of the largest ue or vent connection
plus 50% of the areas of the additional vents or ue
connections. The chimney must be able to sufciently
vent all appliances operating at the same time.
12. The ue pipe shall not be connected to a
chimney ue serving a solid fuel appliance or any
mechanical draft system.
13. All unused chimney openings should be closed.
14. All vent pipe run through unconditioned areas or
outside shall be constructed of factory-built chimney
sections (see Figure 6).
15. Where condensation of ue gases is apparent, the vent
shall be constructed to prevent the condensation from
entering the ue transition box opening. Provisions
shall be made to drain off the condensate (see Figure
6).