32
Restrictors
Install the restrictors in the roof of the
fi
rebox behind
the top liner panel. Adjust the restrictors before
installation of the top liner panel. Should subsequent
adjustment be required, you will need to remove the
top liner panel—see page 53.
MOST INSTALLATIONS REQUIRE RESTRICTORS for
improved
fl
ame picture and performance. This unit is
supplied with restrictors having four di
ff
erent positions
or settings. The level of restriction required depends on
the vertical rise in the venting system and, to a lesser
degree, the horizontal run and number of elbows.
The amount of restriction is based on laboratory tests.
The ideal restrictor position may vary slightly, especially
when the vent pipe length is near the limits of the
acceptable con
fi
gurations for each
type of restrictor.
The chart on the previous page
shows the vent restrictor positions
required relative to the length of the
vent pipe.
To set the restrictors position:
1. Establish the required position
of the restrictors looking up the
venting table on the previous
page.
2. Fasten the restrictors using the
screws (2) already installed on
each side of
the
fi
rebox roof
ports.
3. Slide the restrictors in the re-
quired position.
4. Tighten the screws.
Venting
Co-axial
Position #1
Position #2
Position #3
Position #4
INSTALL HERE
