Vermont Castings VFF32LI Installation & Operating Instructions Manual page 38

VFF Vent Free Fireplace System
The use of outside air for combustion is optional unless
required by building codes. It is only necessary to supply
outside combustion air to one side of the fireplace. Use the
model AK4 combustion air kit.
MODEL AK-4 COMBUSTION AIR ASSEMBLY
1. Remove the cover plate from the 4" outlet opening
location on the left or right outside of the fireplace.
2. Place the insulation ring between the AK-4 starting collar
and fireplace wall.
3. Place the starting collar (4") into the hole on the side
of fireplace. Fasten it in place with the four sheet metal
screws provided. Figures 64 and 65
Left Side of
Fireplace
Shorter End
of Air Starting
Collar
FP1900
Figure 64 -
Attach Outside Air Starting Collar and
Insulation Ring to Left Side of Fireplace
Air Starting
Collar
FP1900
OA start collar
8/08
FP1901
Figure 65 -
Attach Outside Duct to Starting Collar
Use FP-4 U duct for maximum efficiency
and safety. Do not use a combustible duct.
Always use UL Listed Class ) or 1 duct
material.
38
Insulation Ring
AK-4 Starting
Sheet Metal
Collar
Screws
Duct
Screws
Left Side of
Fireplace
FP1901
secure outside duct
8/08
OUTSIDE COMBUSTION AIR
DO NOT remove the cover if the outside air
will not be connected.
NOTE: The air starting collar extends through the fireplace
outer wrap. When the air starting collar is securely
attached, it will form a seal against the fireplace wall.
4. Attach outside duct to starting collar with duct clamp or
screws. Figure 66
5. Cut a 6-inch diameter opening for model AK-4 in the
outside wall covering where the outside vent is to be
located. Figure 66
6. Select and cut a piece of duct long enough to attach to
the fireplace and stick out at least 3" beyond the face of
the wall to which the AK-4 inlet air vent will be attached.
Figure 65
6" Diameter
Hole
Duct
Extending
3" Min.
FP1904
Figure 66 -
Combustion Air Assembly for
Model No. AK-4
Screw
AK-4 Inlet
Air Vent
FP1904
AK4 install
8/08
20308184
Nail
Holes
Screws