Flue Damper; Outside Air; Glass Doors - Heatilator BIR50-B Owner's Manual

1. Flue Damper

The flue damper must be in the fully opened position
(handle up toward the top of the fireplace) during op-
eration of the fireplace.
Before lighting the fireplace, verify fully open position
by looking up from the inside of the fireplace.

2. Outside Air

Refer to Figure 3.2 for location and operation of control.
The outside air kit supplies some combustion air for
your fireplace. It may help reduce the effects of nega-
tive air pressure. Other methods may be required if
more air is needed.
The outside air inlet should be in the fully opened posi-
tion during operation of the fireplace.
Close the inlet to prevent cold drafts when the fireplace
is not being used.
CAUTION! Outside air control handle may be warm.
Adjust before lighting fire.
10 Heatilator • Birmingham BIR50-B Owner's Manual • 4059-700 • Rev Q • 06/23

3. Glass Doors

• Glass doors are optional.
• Refer to Figure 3.3 proper use.
FULLY OPEN
CORRECT
FULLY CLOSED
CORRECT
Figure 3.3 Operating Positions of Bi-fold Doors
PARTLY OPEN
INCORRECT
PARTLY CLOSED
INCORRECT