RSF Woodburning Fireplaces OPEL AP Owner's Manual page 10

OPEL AP
24"
38 1/2"
8 3/4" min. to
side wall
49"
38 1/2" 24"
Figure 4: Location and framing dimensions
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.
Outside air
connection
Opel AP
Insulated flexible air duct
Figure 5: Outside air connection and installation options
Block
These framing dimensions
are larger than required for
ease of installation. The fire-
place has a minimum clear-
ance of 0" to standoff (see
unit dimensions Figure 13).
1
Outside air register
2" aluminium duct tape
Outside wall
18"
38 1/2"
82"
NOTE: When framing with
2x6's and installing the gravity
vent option, be sure to allow
for the 2" minimum clearance
between the header and the
B-vent pipe. (see Figure 13)
for gravity vent locations.
3. Place the insulated flexible duct over the register tube
and outside air connector sleeve. At both ends, care-
fully pull back the insulation and plastic cover, expos-
ing 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.
2
CAUTION: When running duct around
corners, be sure to prevent crimping
that would restrict the combustion air-
flow.
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. ver-
tical 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.
Page 10
58"