Heatilator • HEIR36-IFT, HEIR42-IFT, HEIR50-IFT Installation Manual • 2458-980 Rev. B • 8/17
26
NOTE:
Exhaust Restrictor ships
in manual bag assembly
Figure 4.12 Exhaust Restrictor Installation
Exhaust Restrictor Instructions
1. Remove the top piece of refractory, if already installed.
2. Break the exhaust restrictor into two pieces. Do this
by bending the part back and forth until it breaks.
See Figure 4.13.
3. Orientate and align the two pieces of the exhaust
restrictor as shown in Figure 4.13.
4. Match the amount of vertical you have in the system
with the chart to find the appropriate position to set the
exhaust restrictor. See Table 4.1.
5. Center the two exhaust restrictor pieces on the vent at
the setting selected in step 3 and secure in place by
using two self-tapping screws. See Figure 4.12.
6. Reinstall the top refractory.
Vertical
Pipe
HEIR36
HEIR42
HEIR50
Up to 10 ft.
No
Restrictor
No
Restrictor
No
Restrictor
11-30 ft.
1-1
1-1
1-1
31-50 ft.
2-2
2-2
2-2
Table 4.1.
Figure 4.13 Exhaust Restrictor Installation
BREAK
HERE
EXHAUST RESTRICTOR SET TO 1-1
1
1
1
1
2
2
3
3
4
4
5
5
5
5
2 3 4
2 3 4
Exhaust restrictors are recommended for these vertically
terminated products which have excessive draft. Exhaust
restrictors will compensate for high draft, and restore vi-
sual flame height. If the vent configuration has a total ver
-
tical of 11-50 feet, an exhaust restrictor may be needed.
The exhaust restrictor can be located in the appliance
manual bag.
EXHAUST
RESTRICTOR