23
Inside
fi
rebox—roof venting port
Position #1
Position #2
Position #3
Position #4
Position #5
Restrictor Settings
The restrictor is located in the roof of the
fi
rebox
hidden above the top liner panel. Adjust the restrictor
before installation of the top liner panel. Should
subsequent adjustment be required, you will need to
remove the top liner panel—see page 43.
ALL INSTALLATIONS REQUIRE A RESTRICTOR
for
improved
fl
ame picture and performance. This unit is
supplied with a pre-
fi
tted restrictor having
fi
ve di
ff
erent
positions or settings. The restrictor is shipped mounted
at the maximum open position which is used for rear
venting with no vertical rise. 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 required relative to the
length of the vent pipe.
To set the restrictor position:
1. Establish the required position of the
restrictor looking up the venting table
on the previous page.
2. Release the screws (2) on each side of
the restrictor already installed
on the
fi
rebox roof port
.
3. Slide the restrictor in the required posi-
tion.
4. Tighten the screws.
Venting
Co-Axial
