20
1
2
3
4
5
View showing fully
open restrictor plate
View showing fully
closed restrictor plate
1
2
3
4
5
Figure 21: Restrictor plate settings
The ENVIRO WESTPORT has been designed with a built in restrictor
plate. The restrictor is designed to enhance flame appearance when
installing this unit with vertical chimneys as well as installations with
longer horizontal vent applications. It does this by controlling the
amount of air moving through the vent pipe.
Figure 22 shows the vent restrictor position required, relative to the
length of vent pipe. Longer vertical vent lengths necessitate greater
restriction; position 1 is open and position 5 is maximum restriction
(refer to Figure 21). To avoid injury, it is best to make this adjustment
when the fireplace is cool or use welder’s gloves or oven mitts.
v
ent
c
onFiguRations
anD
R
estRictoR
s
ettings
:
Figure 22 & Figure 23 show the range of venting options, they show possible vent configurations if the unit
is top vented (see Figure 22) or rear vented (see Figure 23), for vertical and horizontal terminations, any
layout that remains within the shaded area is acceptable. Having the fewest number of elbows is ideal, as
they tend to disrupt air movement. Using 45˚ elbows is preferable to using 90˚ elbows. Also, a shorter vent
system will perform better than a longer one.
Figure 22: Possible Vent Configurations for Top Vented;
Vertical and Horizontal Terminations�
To access vent restrictor remove the valve
cover plate from the right rear corner of the
unit by undoing the two fastening screws.
Loosen the ¼” hex head screw and adjust to
the correct setting.
Slide the hex head screw to the next setting
and re-tighten the screw to secure in place.
The numbers in this chart represent the actual
vent restrictor settings. Although the numbers
do not appear on the unit use this as a guide
to follow.
Wait for unit to warm up to operating
temperature to ensure proper and clean
burning unit.
Figure 23: Possible Vent Configurations for Rear
Vented; Vertical and Horizontal Terminations.
Note: 0,0 in Figure 22 & Figure 23
represent the outlet of the flue
collar elbow.
Initial Installation
QUALIFIED INSTALLERS ONLY
