38
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 60:
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.
Vertical
Termination
Storm Collar
Flashing
Roofing nails
Elbow Strap
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 51.
