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Horizontal Wall Vent Terminations
The position of the horizontal vent termination must be positioned in such a way as to meet all local building
codes. Attach the correct length of pipe. Mark the center line of the pipe facing the wall (allowing for a 1/4”
rise per foot of horizontal, example 10 ft of horizontal would require a rise of 2.5”).
NOTE: ALLOWING THE VENT PIPE TO SLOPE DOWN TOWARDS THE VENT TERMINATION COULD
CAUSE POOR COMBUSTION AND/OR HIGH TEMPERTURES THAT MAY PRESENT A FIRE HAZARD.
Mark a 9” x 9” square around the center mark (inside dimensions). Cut and frame the exterior wall to accept
the wall thimble. Install the wall thimble, on the inside of the exterior wall, shield using wood screws.
Attach the venting to the termination using sheet metal screws, for Z-Flex installations a Inca Metal Cutting’s
termination part # IMC1070A or IMC1070B shall be used and when using Simpson Dura-Vent or Security
Venting a Simpson Dura-Vent termination part # P574 shall be used. If termination is to be installed on vinyl
siding using vinyl siding standoff part # IMC1151.
To install the termination attach the 4” exhaust to the termination and fasten with 3 #8 x ½” hex head sheet
metal screws then attach the 7” vent to the termination and fasten with 4 #8 x ½” hex head sheet metal screws,
be sure that the flex vent overlaps the termination collars a minimum of 2”. Then attach the termination to the
exterior wall using four wood screws through the holes in the corner of the vent terminal.
The next step is to apply a bead of mil-pac or RTV 106 to top of the 4” exhaust collar on the unit and attach the
4” vent using screws (as described above), finally apply a bead of mil-pac or RTV 106 to top of the 7” vent and
attach (as described above).
Vertical Installations
Always maintain a 1” clearance around the vent pipe (vertical) and 1” clearance horizontal, when passing
through ceilings, walls, roofs, enclosures, attic rafter or any combustible surfaces.
DO NOT PACK AIR SPACES WITH INSULATION.
When passing through a flat ceiling install a Box/Wall thimble. Cut a 9” square hole and frame as shown in the
diagram opposite.
NOTE: ALWAYS CHECK YOUR LOCAL CODES BEFORE INSTALLING VENTING. CLEARANCES ETC, MAY VARY
FROM STATE TO STATE (PROVINCE TO PROVINCE).
NOTE: CONSULT DURAVENT PARTS LIST OR INCA METAL CUTTING’S FIREPLACE
MANUFACTURING PARTS LIST FOR PART NUMBERS.
See section 3.3.10 Venting for instructions on how to connect Security Venting or
Simpson Dura-vent.
9” x 9” opening
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