Warning:
Every measurement and clearance on the illus-
trations must be followed to assure safety of the installa-
tion.
Installation
CAUTION: Do not replace the grille from (Figure 28)
with shutters. Do not allow heat to be trapped in the
gravity vent system.
1. Plan the gravity vent run first. Be aware that the max-
imum actual pipe length between the top of the fireplace
and the outlet is 15 feet. There is no maximum number
of elbows in a run, but the run must never go in a down-
ward direction as this can trap heat in the gravity vent
system.
2. The grille adapter is designed to be installed under-
neath the gypsum board in the wall. In the desired loca-
tion, frame a 13" x 13" hole to accept the gravity vent
grille adapter. Fit the gravity vent grille adapter into the
framed hole and fasten it into place with nails or screws.
If you are installing the outlet in an already finished area,
you must remove the gypsum board and frame a 13" x
13" hole in the existing framing, in order to meet the
required clearances.
3. Remove the outer cover to the left side of the flue out-
let on the Delta.
4. Cut the insulation to the size of the opening and slide
the cover plate underneath to the side (it is taped in
place).
5. Install the B-vent starter section. By putting your hand
up inside and underneath, bend up at least two of the
four tabs at the base of the starter section to hold it in
place.
6. Install the “shut-off” damper in the B-vent starter sec-
tion through the left side louvers. The shut-off damper
enables the manual control of hot air flowing through the
gravity vent pipe. With the top left louver removed, and
the angular portion of the rod in hand, insert the damper
rod into the rear hole in the starter section. The rod
should slide in and down the keyhole, making sure that
the #2 washer and spring on the control arm are both on
the outside of the starter section and #1 washer is inside
the starter section. A definite tension should exist
between the shut off damper rod and the starter section.
Replace the louvers. The damper rod should protrude
above the top of the louvers.
7. Install the B-vent pipe between the B-vent starter and
the grille adapter. Fasten each joint with 3 screws (if the
B-vent pipe manufacturer allows this in their instruction
manual). Insert the B-vent pipe in the grille adapter and
fasten it with three screws. The B-vent pipe needs only
to be inserted into the adapter enough to be able to
screw it in place. This allows you about 3 1/2" of play.
Page 20
DELTA
Note: grill is to be oriented
"down" into the room as shown.
59" min.
for child
safety
2" min
4" min
59" min.
for child
safety
2" min
"B"-vent
starter
Figure 28: Gravity vent clearances
optional gravity
vent outlet
"B"- vent grill and adapter
