24
InstallatIon of vent sYsteM, sIdewallWith the route of the venting system and selection of materials completed,
as discussed in the section of this manual titled PLANNING THE VENT
SYSTEM,thethroughthewallventterminalinplaceandtherstsection
ofpiping,uptorstelbow,installedatthebloweritistimetocompletethe
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.
Theventsystem piping should be supported every 5 feet (1.5 m)
ofverticalrunandevery3feet(91cm)ofhorizontalrun.Followvent
pipemanufacturer’sinstructionsforproperjoiningprocedures.
Ifnecessary 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
usetwo90°elbows thatshallbeconsider edalongwiththe
additional vent pipe when calculating maximum equivalent
feet of venting.
InstallatIon of vertIcal vent sYsteMAproperflashingor“BOOT”shouldbeusedtose althepipe
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
every5feet(1.5m)ofverticalrunandevery3feet(91cm)of
horizontalrun.Followventpipemanufacturer’sinstructi onsforproper
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
oftheNationalFuelGasCode(ANSIZ223.1)ortheNatural
GasandPropaneInstallationCode(CAN/CSA -B149.1)andas
listed below:
1. VentTerminationmustextendaminimum of12inches (30cm)
aboveroofor12inches(30cm)abovetheanticipatedsnowlevel
to prevent blockage of the vent termination, as shown in Figures
20 and 21.