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30
METAL CASE EXTENSION FOR WALLS DEEPER THAN 13-1/8" (11-1/8" WITH SUB-BASE)
FIELD FABRICATED – GE RECOMMENDS THE USE OF ONE OF THE DEEPER RAB71 WALL CASES OFFERED AS SPECIAL ORDER ITEMS. SEE PAGE 29.
CAULK*
SPLITTER BETWEEN
AIR INTAKE AND
DISCHARGE
Zoneline units can be installed in walls of greater
depth than the wall case. Where the case recession
is less than 3” and where it is possible to waterproof
the exposed sides and top of the opening, the
suggested procedure is to apply a flashing to the
bottom of the wall case as shown on page 29.
Where waterproofing is questionable or not
possible, or for installations in walls of greater
depth, the following is a suggested application
procedure. It involves the field fabrication of a case
extension. Since the wall case is a water bearing
container, the extension likewise must also be
water bearing and the connection between the two
must be watertight. The case extension must
contain splitters to prevent recirculation of the
outdoor air circuit.
1. The case extension is field fabricated. The
extension depth “D” should allow for a minimum
outdoor projection of 1/4”. This allows for room
cabinet clearance to the finished wall and ample
surfaces to apply sealant or caulking for a tight
weather seal between the completed wall
case/extension assembly and the wall opening. It
is recommended that the extension be painted
and corner and lap joints be additionally sealed
with a quality grade sealant.
2. The wall case and extension should be
connected prior to installation in the wall
opening. A quality grade sealant should be
applied to all four (4) butting flanges. Use bolts
and nuts or oversized self tapping screws
(driven from the wall case to the extension) to
attach the two assemblies. Clean all drain holes
of excess sealant. The assembly must be free
draining.
3. Install flashing, using a quality grade sealant
between the flashing and wall as shown in
section A-A below.
4. Install the wall case/extension assembly
following procedures described for a standard
installation. See diagrams below. The assembly
should be sealed or caulked to the wall around
all four sides both outdoors and indoors.
NOTE: The wall case/extension assembly should
be level.
5. Suggested materials for case extension and
flashing should be non-ferrous metals. Minimal
acceptable material: Galvanized G-90 painted.
SEALANT - ALL
FOUR (4) FLANGES
6-1/4" ± 1/4"
AS REQ'D.
CUT DRAIN SLOTS
IN BOTH FLANGES
(FOUR REQUIRED)
TO MATCH DRAIN
HOLES IN RAB71/77
FLANGES AND
DRAIN HOLE
LOCATIONS
SAME AS ON
WALL CASE
1" WIDE
45° DRIP LIP
FLASHING (FIELD SUPPLIED)
13-3/4" + D"
2" MIN.
D
10-5/8" ± 1/4"
CAULK*
CAULK*
CAULK*
WALL -
ANY
CONSTRUCTION
RAB71/77ROOM
CABINET
CASE
EXT.
SEE DETAIL
SECTION A-A
*Caulk around perimeter of wall case all four sides
where it joins the building - Interior and Exterior.
EXTENSION
ALL 4 FLANGES
WALL CASE
ALL 4
SIDES
WALL
FLASHING
ALL 4
SIDES
SECTION A-A
BASEPAN/FLANGE DESIGN
SHOWING SEALANT LOCATIONS.
1/4" MIN.
RAB71/77
WALL CASE
1-1/2"
(4 SIDES)
EXTENSION
(FIELD
SUPPLIED)
2020 Data Manual 2002 11/7/02 3:19 PM Page 30
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