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FV42
85-03-01068
Vertical Through-The-Roof Venting
The maximum vertical run of vent pipe is 40’ from the top of the fireplace. The fireplace will support a run of
a maximum of 40’. Maintain 1" air space clearances on all sides of vents.
If an offset is required directly on top of the fireplace, two 45
°
elbows may be connected directly to the top of
this fireplace to create a horizontal offset then to run upwards vertically. Doing so will continue to allow the
use of the 40’ maximum vertical run.
Follow these steps to install venting:
1. Place the fireplace in its desired location. Drop a plum bob from the ceiling to the position of the
fireplace flue exit. Mark the location where the vent will penetrate the ceiling. Drill a small hole at this
point. Next, drop a plum bob from the roof to the hole previously drilled in the ceiling. Mark and drill
the spot where the vent will penetrate the roof. Determine if ceiling joists, roof rafters or other framing
will obstruct the venting system. You may wish to relocate the fireplace or to offset to avoid cutting load
bearing members.
2. Cut and frame a 10" x 10" opening in the ceiling, centered on the hole drilled in Step No. 1.
3. To determine the length of the vent pipe required, measure the distance from the fireplace flue outlet
to the ceiling, the ceiling thickness, and the vertical rise in the attic or second story and allow sufficient
vent height above roofline. For two-story installations, fire stops are required at each floor level. If an
offset is needed in the attic, additional pipe and elbows will be required.
4. Assemble the desired lengths of vent pipe and elbows to reach from the fireplace flue outlet. Ensure
that all vent pipe and elbow connections are in their fully twist-lock position and that inner pipe joints
(DuraVent only) are sealed and are leak-proof. Maintain 1" airspace clearances to combustibles (3"
above horizontal runs). Cut a 10" x 10" opening in the roof, centered in the small drilled hole placed in
the roof in No. 1. The opening should be a sufficient size to meet all clearance requirements. Continue
to assemble lengths of pipe and elbows necessary to reach up through the roofline. Galvanized pipe and
elbows may be used in the attic as well as above the roofline. The galvanized finish is desirable above
the roofline due to its higher corrosive resistance.
5. If an offset is necessary, it is important to support the vent pipe every 3’ to avoid excessive stress on the
elbows and possible separation. Wall straps are available for this purpose.
6. Slip the flashing over the pipe sections protruding through the roof. Secure the base of the flashing to
the roof with roofing nails and seal flashing to roof. Ensure the roofing material overlaps the top edge of
the flashing. Verify you have at least the minimum clearance to combustibles at the roofline.
7. Continue to add pipe sections until the pipe and the vent cap meet the minimum building code
requirements.
8. For multi-story vertical installation, a ceiling fire stop is required at the second floor and any subsequent
floors. The opening should be framed to 10" x 10" inside dimensions.
9. Any occupied areas above the first floor, including closets and storage spaces, which the vertical vent
passes through, must be enclosed. The enclosure may be framed and sheet rocked with standard
construction materials, however, be sure to maintain minimum allowable clearances between the
outside of the vent pipe and the combustible surfaces of the enclosure.
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