OUTSIDE AIR DUCT
After the fireplace is correctly positioned, connect the com-
bustion air inlet to the outside (see Figure 5).
A 4 inch diameter duct can be used if the total run of the
pipe is less than 25 feet. If the total run is longer than 25
feet, a 5 inch diameter pipe must be used.
1. Find a convenient location for the combustion air duct
and register. The location of the register may be above
or below floor level.
2. Make a 4 1/4"(5 1/4" if using a 5" diameter duct) hole in
the outside wall of the house. Mount the register in the
hole from the outside with the inlet facing down.
3. Place the insulated flexible duct over the register tube
and outside air connector sleeve. At both ends, carefully
pull back the insulation and plastic cover, exposing the
flexible duct. Then at each end, attach the duct with
metal screws to the inlet and tube. Carefully push the
insulation and cover back over the duct. Tape the plastic
cover in place with the 2" aluminum duct.
CAUTION: When running duct around corners, be sure to
prevent crimping that would restrict the combustion airflow.
Use an insulated duct rated at over 200° F. Our testing has
shown that as long as the 5" diameter insulated duct is uti-
lized properly, there is no restriction on the length of the
run. It is recommended that the duct does not exceed 12
ft. vertical height rise above the base of the unit. The air
inlet should never be less than 5 ft. below the top of the
chimney flue and should not terminate in attic spaces.
Outside air control
The Opel AP is designed to use outside air for combustion
but you may choose to use inside air for combustion air
instead. To do so, open the sliding door on the bottom
inside right of the fireplace (behind the bottom louvers).
Note that the fireplace uses outside air when the handle is
closer to the back of the fireplace and inside air when it’s
closer to the front.
We recommend the use of outside air
for combustion.
CHIMNEY
This fireplace is certified for use with 7” ICC Model EXCEL
chimney. The chimney system height from the top of the
fireplace must be a minimum of 12 ft. and a maximum of 40 ft.
We recommend that the minimum height be increased by
approximately 1 ft. for every 2000 ft. elevation above sea
level. Every 30° or 45° elbow also increases the minimum
height by 1 ft. For example, if you are living 6000 ft. above
sea level, your chimney should terminate at least 15 ft.
from the top of the fireplace (12 ft. + 3 ft. for the 6000 ft.).
(See Table 1) for more precise recommended flue heights.
Page 11
OPEL AP
Outside air
connection
1
2
Opel AP
Outside air register
2” aluminium duct tape
Insulated flexible air duct
Outside wall
Figure 5: Outside air connection and installation options
