Initial Installation
QUALIFIED INSTALLERS ONLY
Step 4.
Assemble the desired
lengths of black pipe
and elbows necessary to
reach from the appliance
adapter up through the
Round Support Box.
Insure that all pipe and
elbow connections are
in their fully twist-locked
position.
Figure 35. Vertical Vent Termination
Step 4.
With the hole now framed, the wall thimble installed, and the pipe extending into the wall,
proceed to the outside. Attach the termination to the pipe using RTV and Mil-Pac or Rutland No
78 Stove and Gasket Cement to seal joints. The vent pipe must extend into the vent cap at least
1¼ inches (3.2 cm). Secure the connection between the vent cap and the pipe by attaching the
two (2) sheet metal straps, which extend from the vent cap assembly to the outer wall of the
vent pipe. Bend any remaining portion of the strap back towards the vent cap. Security Secure
Vent uses a twist lock cap.
Step 5.
Position the horizontal vent termination in the center of the 10 inches (25.4 cm) square hole
and attach to the exterior wall with the four screws provided. The arrow on the vent termination
should be pointing up. Run a bead of non-hardening mastic around the edges of the vent
cap, to make a seal with the wall. Ensure the proper clearances to combustibles have been
maintained.
v
eRticaL
t
eRmination
:
Step 1.
Check the instructions for required clearances (air spaces) to combustibles when passing
through ceilings, walls, roofs, enclosures, attic rafters, or other nearby combustible surfaces.
Do not pack air spaces with insulation.
Step 2.
Set the gas appliance in the desired location. Drop a plumb bob down from the ceiling to
the position of the appliance flue exit, and mark the location where the vent will penetrate
the ceiling. Drill a small hole at this point. Next, drop a plumb bob from the roof to the hole
previously drilled in the ceiling, mark 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 appliance, or to offset, to avoid cutting load bearing members.
Step 3.
To install the Round Support Box/Wall Thimble in a flat ceiling, cut a 10 inch (25.4 cm) square
hole in the ceiling, centered in the hole drilled in Step 2. Frame the hole as shown in Figure 27.
Vertical
Termination
Storm Collar
Flashing
Roofing nails
Elbow Strap
30
