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installing gravity vent
A gravity vent may be installed to supply additional heat to
the room the fireplace is in or to adjacent rooms. Figures
, 3 and 4 show the necessary components for gravity
vent ductwork. These parts must be fabricated or supplied
by your fireplace dealer.
caUTioN: Two () flex ducts must be installed.
NoTeS:
1. 1" (5 mm) minimum air space must be maintained
around the flex ducts.
. If the flex ducts are going to be stretched beyond their
shipped length, cut the insulation in the middle and
use half at the unit end and the other half at the duct
outlet end.
3. The flex ducts may also be vented to
rooms.
Duct Box
(Fig. 3)
Wall
Grate
Aluminum 303 "0" Temper
.0065 Thick Triple Lock
Flex duct 8" Dia.
Fig. 22 Gravity vent components.
12 "
10
"
FP2427
6
"
gravity vent comp
2
"
4
"
7
"
Fig. 23 Duct box dimensions
30004508
FP2428
duct box dims
adjacent
Polyethyline Jacket Covering
1" of 3/4 lb Insulation
Cut away to
show alumi-
num duct.
Do not cut
for installa-
tion.
Flex Duct
Collar
(Fig. 4)
FP47
5 "
3 "
9/32"
3
8" Dia.
FP48
5/8"
Made from .06" thick aluminized sheet metal
Fig. 24 Flex duct collar dimensions.
FP2429
installation instructions
flex duct collar dims
1. Remove knockout from outer top of fireplace.
. Remove the circular cutout from the white insulation
under the outer top.
3. Remove the two () screws holding each of the cover
plates onto the top heat shield below the white insula-
tion. Remove the cover plates.
4. Insert the flex pipe collar down through the hole in the
outer top, tab end first.
5. Reach down through the flex pipe collar and bend the
three (3) tabs to hold the collar in place above the top
heat shield.
6. Select the flex duct location. The flex ducts can vent
through the side of the chase, through its front, or one
each through both the side and the front. Either or both
flex ducts may also be vented into a room behind, be-
side or above the room in which the fireplace is in-
stalled. The flex ducts must be installed at least 1"
(305 mm) from the ceiling and no lower than 4" (610
mm) above the top of the fireplace. Figures 5 and 6
show construction dimensions for some of the com-
mon flex duct placements.
7. Install the flex duct. Before installing the flex duct box
assemblies, you may wish to paint the inner surfaces
with high temperature stove paint to reduce the glare
from reflected light.
Install the two duct box assemblies in their framed open-
ings. (Fig. 7)
If desired, paint the inner surface of each flex duct for
about 6" (15 mm) to eliminate reflected glare; attach this
end to the flange of the duct box assembly.
Cut the tubing a few inches too long with a serrated
kitchen knife - it can be compressed during installation.
The flex duct must fit onto both collars of the duct box as-
semblies and the full length of the " (51 mm)-all the way
around the collars.
"
Secure each end of the flex ducting to the appropriate col-
lar with sheet metal screws provided. Holes for the screws
must be drilled first around the perimeter through both the
flex duct tubing and the flange with an 1/8" (3 mm) bit.
Space the holes as evenly as possible around the collar.
Vermont Castings Stratton
9
"
3/8"
7 " Dia.
FP49
15
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