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Venting
Restrictor Settings
The restrictors are located in the roof of the fi rebox
hidden 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 43.
ALL INSTALLATIONS REQUIRE A RESTRICTOR for
improved fl ame picture and performance. This unit is
supplied with pre-fi tted restrictors having four diff erent
positions or settings. The restrictors are 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 confi 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 look-
ing up the venting table on the previous page.
2. Release the screws (2) on each side of each of the re-
strictors already installed on the fi rebox roof port.
3. Slide the restrictor in the required position.
4. Tighten the screws.
Inside fi rebox—roof venting port
Co-Axial
Position #1
Position #2
Position #3
Position #4
21
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