15
Vermont Castings Stratton
30004508
installing gravity vent
A gravity vent may be installed to supply additional heat
to the room the fireplace is in or to adjacent rooms. Fig-
ures , 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 adjacent
rooms.
FP2427
gravity vent comp
Wall
Grate
Duct Box
(Fig. 3)
Polyethyline Jacket Covering
1” of 3/4 lb Insulation
Cut away to
show alumi-
num duct.
Do not cut
for installa-
tion.
Aluminum 303 “0” Tem-
per .0065 Thick Triple
Lock Flex duct 8” Dia.
Flex Duct
Collar
(Fig. 4)
FP47
Fig. 22
Gravity vent components.
12
6
”
10
6QE
”
6
6QE
”
2
56QE
”
4
(6QE
”
7
56QE
”
14
(6
"
12
3(6:O
”
7
(6QE
”
2
56:O
”
5
556QE
”
9
6QE
”
5
56O
”
3
56O
”
9/32”
3
6:O
”
8” Dia.
FP2428
duct box dims
Fig. 23
Duct box dimensions
FP48
9
6EM
”
3/8”
5/8”
7
(6
” Dia.
FP2429
flex duct collar dims
FP49
Fig. 24
Flex duct collar dimensions.
Made from .06” thick aluminized sheet metal
installation instructions
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
insulation. 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, beside or above the room in which the
fireplace is installed. 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 common 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
openings. (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
assemblies and the full length of the ” (51 mm)-all the
way around the collars.
Secure each end of the flex ducting to the appropri-
ate collar 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.
