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2 FT.
20 INCH MIN.
MIN.
LOWEST
DISCHARGE
OPENING
TERMINATION
CAP
H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
Roof Pitch
flat to 6/12
6/12 to 7/12
over 7/12 to 8/12
over 8/12 to 9/12
over 9/12 to 10/12
over 10/12 to 11/12
over 11/12 to 12/12
over 12/12 to 14/12
over 14/12 to 16/12
over 16/12 to 18/12
over 18/12 to 20/12
over 20/12 to 21/12
Figure 21. Minimum Height from Roof to
Lowest Discharge Opening
For Vertical Terminations - To locate the vent and install
the vent sections:
• Locate and mark the vent centerpoint on the underside
of the roof, and drive a nail through the centerpoint.
• Make the outline of the roof hole around the centerpoint
nail.
• The size of the roof hole framing dimensions depend on the
pitch of the roof. There MUST BE a 1-inch (25.4mm) clear-
ance from the vertical vent pipe to combustible materials.
• Mark the roof hole accordingly.
• Cover the opening of the installed vent pipes.
• Cut and frame the roof hole.
• Use framing lumber the same size as the roof rafters
and install the frame securely. Flashing anchored to the
frame must withstand heavy winds.
• Continue to install concentric vent sections up through
the roof hole (for inside vent installations) or up past the
roof line until you reach the appropriate distance above
the roof (for outside terminations).
HORIZONTAL
OVERHANG
VERTICAL
WALL
X
12
ROOF PITCH
IS X/ 12
H (min.) ft.
1.0
1.25
1.5
2.0
2.5
3.25
4.0
5.0
6.0
7.0
7.5
8.0
19
WARNING: MAJOR U.S. BUILDING CODES
!
SPECIFY MINIMUM CHIMNEY AND/OR
VENT HEIGHT ABOVE THE ROOF TOP. THESE MIN-
IMUM HEIGHTS ARE NECESSARY IN THE INTER-
EST OF SAFETY. SEE THE PREVIOUS DIAGRAM
FOR MINIMUM HEIGHTS, PROVIDED THE TERMI-
NATION CAP IS AT LEAST 20 INCHES FROM A VER-
TICAL WALL AND 2-FEET BELOW A HORIZONTAL
OVERHANG.
NOTE: This also pertains to vertical vent systems in-
stalled on the outside of the building.
To seal the roof hole, and to divert rain and snow from the
vent system:
• Attach a flashing to the roof using nails, and use a non-
hardening mastic around the edges of the flashing base
where it meets the roof.
• Attach a storm collar over the flashing joint to form a
water-tight seal. Place non-hardening mastic around the
joint, between the storm collar and the vertical pipe.
• Slide the termination cap over the end of the vent pipe
and snap into place.
Step 4. Positioning, Leveling and
Securing the Fireplace
The diagram below shows how to properly position, level,
and secure the fireplace.
You must decide on the face finish method and use the
appropriate nailing tabs to secure the fireplace. See 'Step
10, Face Finishing" section.
NAILING TABS
(BOTH SIDES)
Figure 22. Proper Positioning,
Leveling and Securing of a Fireplace
• Place the fireplace into position.
• Level the fireplace from side to side and front to back.
• Shim the fireplace with non-combustible material, such
as sheet metal, as necessary.
• Secure the fireplace to the framing by nailing or screwing.
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