24
InstallatIon of vent sYsteM, sIdewall
With the route of the venting system and selection of materials completed,
as discussed in the section of this manual titled PLANNING THE VENT
SYSTEM,thethroughthewallventterminalinplaceandtherstsection
ofpiping,uptorstelbow,installedatthebloweritistimetocompletethe
installation of the venting system for the sidewall installation.
GRADE
*MIN. 12” (30 cm)
ABOVE GRADE OR
*MIN. 12” (30 cm)
ABOVE
ANTICIPATED
SNOW LEVEL
INSTALL A SNORKEL AS SHOWN
HERE ONLY IF NECESSARY TO
ACHIEVE THE 12” MINIMUM
CLEARANCE ABOVE
THE HIGHEST ANTICIPATED
SNOW LEVEL.
SNORKEL
fIGure 20
It is recommended that the completion of t he venting system start
at the blower assembly and run to the coupling on th e inside wall
of the vent terminal, Figure18.
Theventsystem piping should be supported every 5 feet (1.5 m)
ofverticalrunandevery3feet(91cm)ofhorizontalrun.Followvent
pipemanufacturer’sinstructionsforproperjoiningprocedures.
Ifnecessary to ac hieve the 12” minimum clearan ce above
the highest anticipated snow level, install a snor kel as shown
in bottom portion of Figure 20.
note: With the inst allation of a snorkel it is necessary to
usetwo90°elbows thatshallbeconsider edalongwiththe
additional vent pipe when calculating maximum equivalent
feet of venting.
InstallatIon of vertIcal vent sYsteM
Aproperflashingor“BOOT”shouldbeusedtose althepipe
where it exits the roof. The total vent system should not exceed
the equivalent feet of pipe as listed in Table 1.
Provide support for all pipe protrudin g through the roof. All piping shoul d
be properly secured. The vent system piping shoul d be supported
every5feet(1.5m)ofverticalrunandevery3feet(91cm)of
horizontalrun.Followventpipemanufacturer’sinstructi onsforproper
joining procedures.
fIGure 21
IMportant
The vent system must terminate so that proper clearance s
are maintained as cited in local codes or the cu rrent edition
oftheNationalFuelGasCode(ANSIZ223.1)ortheNatural
GasandPropaneInstallationCode(CAN/CSA -B149.1)andas
listed below:
1. VentTerminationmustextendaminimum of12inches (30cm)
aboveroofor12inches(30cm)abovetheanticipatedsnowlevel
to prevent blockage of the vent termination, as shown in Figures
20 and 21.