Mendota MEDALLION, Installation & Operating Instructions Manual, Page: 14 / 36

B - 1 VERTICAL THROUGH-THE-ROOF VENTING
The maximum vertical run of vent pipe is 35 ft. from the top of the stove. The stove will support a run of a
maximum of 35 ft. Maintain 1 1/2” air space clearances on all sides of vents.
IMPORTANT: REFER TO DRAWINGS ON PAGES 9 & 10 WHILE FOLLOWING THESE INSTRUCTIONS.
The SDV40 Stove must be installed by a qualified Mendota approved service person.
1. Place the stove in its desired location. Drop a plum bob from the ceiling to the position of the stove 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 stove 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 No. 1.
3. To determine the length of the vent pipe required, measure the distance from the stove flue outlet to the ceiling,
the ceiling thickness, the vertical rise in the attic or second story and allow sufficient vent height above roof line.
For two story installations, firestops 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 stove flue outlet through the Round
Ceiling Support Box. Ensure that all pipe and elbow connections are in their fully twist-lock position. (See Page
8,
Twist-Lock Piping
) Maintain 1 1/2" airspace clearances to combustibles.
5.
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 the Ceiling Support Box up through the roof line. Galvanized pipe and elbows may be
utilized in the attic, as well as above the roof line. The galvanized finish is desirable above the roofline due to its
higher corrosive resistance.
a) If an offset is necessary, it is important to support the vent pipe every 3 ft. to avoid excessive stress on the elbows
and possible separation. Wall straps are available for this purpose.
b) Whenever possible, use 45
º
elbows instead of 90
º
elbows. The 45
º
elbow offers less restriction to the flow of
flue gases and intake air. If a 90
º
elbow is necessary there must be a one foot minimum rise from the 90
º
elbow to
the vent cap or to the next offset. A maximum of two 90
º
elbows are allowed per installation.
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 roof line.
7. Continue to add pipe sections until the pipe and the vent cap meet the minimum building code requirements, as
outlined in No. 8 on the following page.
a) For multi-story vertical installation, a ceiling firestop is required at the second floor and any subsequent floors. The
opening should be framed to 10" x 10" inside dimensions as described in step No. 5.
b) 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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