22
Inside firebox—roof venting port
Position #1
Position #2
Position #3
Position #4
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 “Liners” on page 32.
MOST INSTALLATIONS REQUIRE A RESTRICTOR
for
improved
fl
ame picture and performance. This unit
is supplied with a pre-
fi
tted restrictor having four
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
position.
4. Tighten the screws.
Venting
Co-Axial
