46
Wall Framing
Horizontal
Termination
Wall Thimble
Fire Stop
Exhaust Pipe
Combustion Air
Outer Pipe
Elbow
h
oRizontaL
t
eRmination
:
1. Horizontal pipes must not be level. For every 12” (305 mm) of horizontal travel there should
be at least ¼” (6.4 mm) of vertical rise. Never allow the vent to run downward, as this could
cause high temperatures or even present the possibility of a fire.
2. The exterior of the horizontal vent termination must not be blocked or obstructed.
3. If the vent termination is not being attached to wood, the four wood screws provided should be replaced
with material appropriate
fasteners.
4. For buildings with vinyl siding,
a vinyl standoff should be
installed between the vent cap
and the exterior wall. Attach
the vinyl siding standoff to the
horizontal termination. Note
that the termination screws
onto the flat portion of the
standoff which provides an air
space between the wall and
the vent termination. The air
gap prevents excessive heat
from possibly melting the vinyl
siding. For installations
using 5x8 venting a vinyl
standoff is mandatory for
all combustible building
exterior finishes
. See page
40 for more information.
5.
Horizontal pipes must be
supported every 3’ (914 mm).
Plumber’s “all round” strap will
suffice.
6. Ensure venting clearances are
maintained, see page 38 for details.
Step 1.
Set the appliance in the desired location. Check to determine if wall studs will be in the way when
the venting system is attached. If this is the case, the location of the appliance may have to be
adjusted or the venting may have to be offset.
Step 2. Many
direct vent pipe sections are designed with special twist-lock connections. Dry fit the desired
combination of pipe and elbows to the appliance adaptor.
Step 3. With the pipe in the correct position and attached to the appliance, mark the wall for a hole as
directed by specified wall thimble dimensions. Cut and frame the hole in the exterior wall where the
vent will be terminated. If the wall being penetrated is made of a non-combustible material (i.e.
masonry or concrete) a minimum 8 1/2” (21.6 cm) / 11 1/2” (29.2) hole is acceptable.
Figure 67: Horizontal Vent Termination
Initial Installation
QUALIFIED INSTALLERS ONLY
