Empire Comfort Systems DVLT36FP92N-2, Инструкция по установке и руководство пользователя, Страница: 26 / 60

34829-1-0115 Page 26
Notice : Termination cap should pass through the wall firestop from
the exterior of the building. Adjust the termination cap to
its final exterior position on the building.
WARNING
Termination cap must be positioned so that arrow is pointing up.
Attach the termination cap with the four wood screws provided.
Before attachment of the termination, run a bead of silicone sealant
rated above 250°F on its outside edge too, so as to make a seal
to the exterior wall.
Notice: Wood screws can and should be replaced with appropriate
fasteners for use on stucco, brick, concrete or other types
of siding.
CAUTION
If exterior walls are finished with vinyl siding, (or materials that
could become discolored or warp) it is necessary to install a vinyl
siding standoff.
The vinyl siding standoff will be installed between the vent termination
and the exterior wall. See Figure 42. This horizontal vent termination
bolts onto the flat portion of the vinyl siding standoff, so an air space
will exist between the wall and the termination cap.
BOLT (4 REQUIRED)
VENT TERMINATION
WOOD SCREWS (4 REQUIRED)
NUT
(4 REQUIRED)
CUT VINYL SIDING AWAY
TO FIT STANDOFF
▲
►
►
▲
▲
Figure 42
HORIZONTAL TERMINATION
Locate and mark the center point of the venting pipe. Using a nail
on the underside of the roof and drive this nail through this center
point. Make the outline of the roof hole around this center point.
Notice : Size of the roof hole dimensions depend on the pitch of
the roof. There must be a 1 inch clearance (25mm) to the
vertical pipe sections. This clearance is to all combustible
material.
Cover the opening of the vent pipe and cut and frame the roof hole.
Use framing lumber the same size as the roof rafters and install the
frame securely. Flashing anchored to frame must withstand high
winds. The storm collar is placed over this joint to make a water-tight
seal. Non-hardening sealant should be used to completely seal this
flashing installation.
Determining Minimum Vent Height Above the Roof.
WARNING
Major U.S. building codes specify minimum chimney and/or
vent height above the roof top. These minimum heights are
necessary in the interest of safety. These specifications are
summarized in Figure 43.
H
X
12
VENT CAP
GAS VENT
LOWEST
DISCHARGE
OPENING
ROOF PITCH IS X/12
H (Min.) - Minimum height from
roof to lowest discharge opening
▲
▼
◄
▼
▼
◄
ROOF PITCH H (Min.)
Flat to 6/12 12" (305 mm)
6/12 to 7/12 15" (381 mm)
Over 7/12 to 8/12 18" (457 mm)
Over 8/12 to 16/12 24" (610 mm)
Over 16/12 to 21/12 36" (914 mm)
Figure 43
Note that for steep roof pitches, the vent height must be increased.
In high wind conditions, nearby trees, adjoining roof lines, steep
pitched roofs, and other similar factors can result in poor draft, or
down-drafting. In these cases, increasing the vent height may solve
this problem.