Figure 11 – DuraVent Type B Gas Vent User Manual
Page 9
9
prior to construction. note that the enclosure
requires an access door for inspection and
maintenance purposes.
10. Terminations. Where the pipe Sections
pass through the roof, a hole must be cut to
provide a minimum clearance (air space) of
1 inch between the pipe and construction
materials. Straight lengths of pipe are run up
above the roof a minimum of 1-foot. (Refer
to Table 2) a Roof Flashing is placed down
over the pipe, and adjusted so it fits tightly
against the roof, with the pipe Section held
in a position maintaining the 1 inch minimum
clearance from combustibles. The Flashing is
then nailed to the roof. The roofing material
(shingles, asphalt paper, etc.) should overlap
the top edge (uphill side) of the Flashing.
a non-hardening sealant should be used
around the edges of the flashing base where
it meets the roof. non-hardening sealant is
placed around the joint between the Flashing
and the vertical pipe Section and the Storm
collar is then placed over this joint, to make
a watertight seal. (Figure 12) add sufficient
pipe Sections to attain the minimum height
specified in Table 2 (see next page). To
connect the Termination cap to the pipe, hold
cap by its collar, slide collar over locking lugs
of pipe, and twist-lock clockwise. Termination
caps of diameters greater than 16 inches do
not twist-lock, but are affixed with sheet metal
screws.
11. Inspection. This completes the installation
steps. conduct a final inspection to ensure
that all joints are secure, the system is
properly supported, and is mechanically
sound. Especially verify that the one-inch
clearance to combustibles requirement has
been met, and that adequate combustion air
will be furnished to the appliance.
Figure 12
HIGH
WInD
cap
STORM
cOLLaR
FLaSHInG
1 IncH
MInIMuM
cLEaRancE
capS aRE
InTERcHanGEaBLE
DuRacap
cap
SEaLanT
SEE
TaBLE 2
1 IncH
MInIMuM
cLEaRancE
Figure 11
1 IncH
MInIMuM
cLEaRancE
(aLL SIDES)
TEE cap
TEE
REMOVaBLE
accESS
DOOR/panEL
FOR cLEanInG
anD
InSpEcTIOn
FRaMED
EncLOSuRE
GaS appLIancE
WaLL
THIMBLE
WaLL STRapS
WaLL STRap