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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.
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 31. 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 RAB71A/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
RAB71A/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.
RAB71A/77
WALL CASE
1-1/2"
(4 SIDES)
EXTENSION
(FIELD
SUPPLIED)