32
Restrictors
The restrictors are not required when less than 4’-0”
vertical rise in vent system.
Install the restrictors in the roof of the
fi
rebox above
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 49.
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 page 30 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 page 30.
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 required position.
4. Tighten the screws.
Venting
Restrictors
INSTALL HERE
Position #1
Position #2
Position #3
Position #4
Detail—Position #1