14
Venting
Restrictors
SOME INSTALLATIONS REQUIRE RESTRICTORS
.
For improved
fl
ame picture and performance, this unit
is supplied with two different sets of vent restrictors.
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 restrictors.
50
75
Restrictor 50
Restrictor 75
OR
The chart on the previous page shows the vent
restrictor required relative to the length of the vent pipe.
Restrictors are not required for co-linear applications.
To install restrictors:
1. Remove every second screw from the exhaust ports
in the top of the
fi
rebox.
2. Install the restrictors with the removed screws.
INSTALLATION
