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11”
6 1/8”
11”
7 5/8”
1 1/2”Maximum
Siding Material
Figure 53: HeliFire 360 inlet vent box dimensions.
Installers Information
Combustion Air Intake Restrictor
The air intake restrictor regulates the incoming air flow in order to achieve the desired flame appearance. The
desired flame appearance is one in which the flame extends to fill the length of the firebox (approx. 55”). The
position of the restrictor corresponds to the length of venting between the air intake and the firebox. More
airflow will be required as the length of venting is increased (to a maximum of 50’) and less airflow will be
required if the venting length is shorter. The installer must keep in mind that too much air flow will make it
difficult for the gas in the firebox to be ignited and remain lit, while not enough airflow will produce a shorter,
weaker appearance.
To adjust the airflow:
1. With the HeliFire 360 lit, observe the
length of the flame. If flame is too
short, allow more airflow to enter
the venting by loosening the adjust-
ment screw at the front of the intake
venting and move the screw down-
wards in its slot before tightening
the screw up. This will open the
restrictor. Conversely, if the HeliFire
360 has difficulty lighting or staying
lit because of a short venting dis-
tance, loosen the adjustment screw
and move the screw upwards in its
slot. This will reduce the airflow by
closing the restrictor.
2. Observe the flame again. As these
adjustments are guidelines, it may
be necessary for the installer to
repeat the cycle of observation and
adjustment.
Note: The HeliFire 360 combustion air inlet
box is used only with the Surface mount
power vent unit. The Flush mount power vent
unit has its’ air intake built into it.
Surface Mount Power Vent
RESTRICTOR FLAP
ADjUSTMENT SCREW
RAISE SCREW
TO LOWER THE
RESTRICTOR FLAP
Figure 52: HeliFire 360 inlet vent box.
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