Vermont Castings MAGNUM MCUF36E-F Installation And Operating Instructions Manual page 13

OpTIONAL Ak-4 OUTSIDE AIR kIT
DO NOT remove the cover if the outside
air will not be connected.
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 loca-
tion 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 16 and 17
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 17
Insulation
Ring
Shorter End
of Air Starting
Collar
Left Side of
Fireplace
Figure 16 -
Attach Outside Air Starting Collar and Insulation
Ring to Left Side of Fireplace
FP1900
OA start collar
Use Fp-4 U duct for maximum efficiency
8/08
and safety. Do not use a combustible duct.
Always use UL Listed Class 0 or 1 duct
material.
26D4720
Sheet Meal
AK-4 Starting Screws
Collar
Screws
Air Starting
Collar
FP2700
Figure 17 -
Attach Outside Duct to Starting Collar
FP2700
OA duct
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 18
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 17
6"
Diameter
Hole
Duct
Extending
3" Min.
FP1904
Figure 18 -
Combustion Air Assembly for Model
AK-4
MCUF Series Vent-Free Firebox
Duct
Left Side of
Fireplace
Screws
AK-4 Inlet
Air Vent
FP1904
AK4 install
8/08
Nail
Hole
Screws
13